Hox gene complexes in mammals determine cell fate along the anteroposterior axis, where rainfall is low, option (D) is correct.
Hox genes are a family of transcription factors that play a crucial role in determining the identity of body segments during embryonic development in mammals. The Hox genes have been found to be highly conserved across a wide range of animal species, including insects and flatworms.
While Hox genes are primarily involved in embryonic development, they continue to play important roles in adult organisms. For example, Hox genes are involved in the maintenance of adult stem cells and in tissue repair and regeneration, option (D) is correct.
To learn more about Hox follow the link:
https://brainly.com/question/16819317
#SPJ1
Question 12
The researchers predicted that they would see evidence of eutrophication in the upper estuary d
to its close proximity to urbanization, and that they would not see evidence of eutrophication in
lower estuary due to it being further away from urbanization.
Use complete sentences to write a conclusion discussing whether the data you calculated and
graphed supported this prediction or not, and why.
Edit View Insert Format Tools Table
12
12pt Paragraph ✓ BIUAT²V
Refer to the figure showing a cell with two pairs of homologous chromosomes in prophase I of meiosis. Genes A (alleles A and a) and D (alleles D and d) are located on the longer pair of chromosomes, and gene B (alleles B and b) is located on the shorter pair.
How many different combinations of A, B and D alleles are possible in the genotypes of the daughter cells produced from this cell?
4
6
8
16
Answer:
16
Explanation:
There are four different possible combinations of A alleles (AA, Aa, aA, aa), two for B alleles (BB, Bb), and four for D alleles (DD, Dd, dD, dd).
Therefore, the total number of different combinations of A, B, and D alleles that can be produced in the daughter cells is:
4 (possible combinations of A alleles) x 2 (possible combinations of B alleles) x 4 (possible combinations of D alleles) = 32
However, we have to keep in mind that these combinations can be mixed and matched in different ways, so we need to divide by the number of possible arrangements of the same alleles (i.e. 2 for A and D alleles and 1 for B alleles) to avoid counting duplicates.
Therefore, the final number of different combinations of A, B, and D alleles that can be produced in the daughter cells is:
(4 x 2 x 4) / (2 x 1) = 16
Hope this helps!
Researchers studied how getting too little sleep affects the human immune
system. Which of these is a control variable?
A. The immune system response
B. Both getting too little sleep and the immune system response
C. Neither getting too little sleep nor the immune system response
D. Getting too little sleep
Answer:
the answer is "c"
explanation
control variables are any thing that are held constant or limited in a research study. it is a variable that is not of interest to study objectives, but is controlled because it could influence the out comes. so in the research above we need to study the influence of getting too little sleep on human immune. in other word getting too little sleep is independent variable which may have an effect on dependent variable human immune. also human immune response is a value we have to measure to decide whether the independent variable affect the result or not. control variables for the above research are like the food the experimental group and the standard group eat, the bed the in which the experiment is done and so on.
give reason The Weight is dependent upon the mass of a body at a given place.
Weight is the force exerted on an object due to gravity and is dependent upon the mass of the object and the gravitational force at a given place.
Thus, the gravitational force is proportional to the mass of the object, and the gravitational acceleration is a constant value determined by the mass of the Earth and the distance between the object and the center of Earth.
Therefore, the weight of an object at a given place depends on its mass because the gravitational force is directly proportional to its mass. A heavy object will experience a greater gravitational force than a less massive object when placed at the same location.
Learn more about the gravitational force here:
https://brainly.com/question/12528243
#SPJ1
The male part of a flower is called the A) ______, of which a flower can have many! This is divided into 2 parts. The long and narrow filament is topped by the B) _____which makes pollen! Pollen contains the male reproductive cell. The female part of a flower is called the C) _____...a flower can only have one! It is, though, divided into 3 parts. The D) _____is the sticky top part. Its job is to catch pollen! The round bottom part of the pistil is called the E) _____. Its job is to produce female egg cells. These 2 parts are connected by a tube called the F) _____. The outer part of the flower is called a petal. A flower may have several colorful petals. Petals attract insects and mammals to the flower for G) ______ to occur.
Answer:
A) Stamen
B)Anther
C)Pistil
D)Stigma
E)Ovary
F)Style
G)Pollination
Hope this helps!!
Phylogenetic tree
Method of analysis used
Most distantly related species
The method of analysis used to create a phylogenetic tree may be DNA or RNA analysis from different organisms.
The most distantly related species on a phylogenetic tree are located are furthest apart from each other.
What is a phylogenetic tree?A phylogenetic tree is a branching diagram or tree that depicts the relationships that have developed over time between different biological species or other entities based on the similarities and variances in their genetic or physical traits.
One evolutionary tree represents all life on Earth and shows their shared ancestry.
Learn more about the phylogenetic tree at: https://brainly.com/question/2189834
#SPJ1
The cellular machinery use theses instructions to a string of corresponding amino acids
The order of nucleotides in a gene contains the instructions utilized by the cellular machinery to link together corresponding amino acids. Genes are sections of DNA that contain information needed to create proteins. The genetic code determines the order of nucleotides in a gene, which in turn specifies the order of amino acids in a protein.
The genetic code is a collection of guidelines that specify how amino acids and nucleotide triplets (codons) match together. The ribosome, a component of the cellular machinery in charge of protein synthesis, translates a messenger RNA (mRNA) molecule's codon sequence into a corresponding sequence of amino acids during protein synthesis. This procedure entails the binding of particular transfer RNA (tRNA) molecules to the codons on the messenger RNA (mRNA), each of which carries an individual amino acid that is appropriate for the codon.
Learn more about amino acids, here:
https://brainly.com/question/28409615
#SPJ1
The order of nucleotides in a gene contains the instructions utilized by the cellular machinery to link together corresponding amino acids. Genes are sections of DNA that contain information needed to create proteins. The genetic code determines the order of nucleotides in a gene, which in turn specifies the order of amino acids in a protein.
The genetic code is a collection of guidelines that specify how amino acids and nucleotide triplets (codons) match together. The ribosome, a component of the cellular machinery in charge of protein synthesis, translates a messenger RNA (mRNA) molecule's codon sequence into a corresponding sequence of amino acids during protein synthesis. This procedure entails the binding of particular transfer RNA (tRNA) molecules to the codons on the messenger RNA (mRNA), each of which carries an individual amino acid that is appropriate for the codon.
Learn more about amino acids, here:
https://brainly.com/question/28409615
#SPJ1
Can someone help me with this?!
Does anyone know the connection between evolvability and modularity? Using the word integration!
Explanation:
Yes, there is a connection between evolvability and modularity, and the key concept that connects them is "integration".
Modularity refers to the organization of a system into discrete, interchangeable components (modules) that can be combined in various ways to create different functions. Modularity makes systems more evolvable because it allows for incremental changes to be made to individual modules without disrupting the overall functionality of the system.
Integration, on the other hand, refers to the process of combining separate modules into a cohesive whole. In order for a modular system to function effectively, the modules must be integrated in a way that maintains their independence while also enabling them to work together to achieve a common goal.
The connection between evolvability and modularity, then, is that modularity enables evolvability by allowing for the evolution of individual modules without disrupting the overall function of the system, while integration enables modularity by allowing for the combination of separate modules into a functional whole.
In summary, the connection between evolvability and modularity is that they are mutually reinforcing concepts, with integration playing a crucial role in enabling both.
The state of Louisiana contains vast amounts of fossil fuels that are harvested and used for energy. Louisiana ranked in the top ten states in the U.S. for the production of both crude oil and natural gas in 2015. During that same year, Louisiana residents used the most energy per person compared to residents of other states in the U.S.
Based on this information, why might the distribution of the fossil fuels change in Louisiana?
A. Fossil fuels are an unlimited resource, and they will eventually increase in Louisiana because of increased production.
B. Fossil fuels are an unlimited resource, and they will eventually run out in Louisiana due to larger supplies in other states.
C. Fossil fuels are a limited resource, and they will eventually run out in Louisiana because of rapid human use.
D. Fossil fuels are a limited resource, and they will eventually increase in Louisiana because they are replaced quickly.
C. Fossil fuels are a limited resource, and they will eventually run out in Louisiana because of rapid human use.
What is limited resource?A limited resource is any natural or man-made resource that is available in a limited quantity. Limited resources can be either renewable or non-renewable. Examples of renewable limited resources include water, forests, arable land, and energy from renewable sources such as solar, wind, and geothermal. Examples of non-renewable limited resources include mineral and fossil fuels such as coal and oil. Limited resources are essential for the production of goods and services, and the continued functioning of the global economy.
Louisiana's high level of energy use per person compared to other states indicates that the fossil fuels in the state may be used up at a faster rate than other states. This would cause the distribution of fossil fuels in Louisiana to decrease over time.
To learn more about limited resource
https://brainly.com/question/31095183
#SPJ1
Which of the following is an example of
a trait that is NOT inherited according to
Mendel's laws of heredity?
F Pod color in pea plants
G Any trait determined by two alleles
H Any trait determined by genes located on
different chromosome
J Flower color in snapdragons
Answer: J Flower color in snapdragons is an example of a trait that is not inherited according to Mendel's laws of heredity.
Explanation: The inheritance of flower color in snapdragons is an example of incomplete dominance, where the offspring have a phenotype that is intermediate between the phenotypes of the two parental alleles. This means that the inheritance of the trait cannot be explained solely by the presence of dominant and recessive alleles, which is the basis of Mendel's laws.
Determine the surface area-to-volume ratio of the four L. lactis groups. Identify the group with the greatest surface area-to-volume ratio and explain what this largest ratio means with respect to galactose breakdown.
Answer:
Without more information about the specific L. lactis groups being referred to, I cannot provide a definitive answer to this question. However, in general, the surface area-to-volume ratio of a cell can be calculated as follows:
Surface area-to-volume ratio = Surface area / Volume
The surface area of a cell is important because it determines the amount of nutrients and waste that can pass in and out of the cell. The volume of a cell is important because it determines the amount of metabolic activity that can occur within the cell.
In general, cells with a high surface area-to-volume ratio are more efficient at exchanging nutrients and waste, because they have a larger surface area relative to their volume. This is particularly important for cells that require a lot of nutrients to function, such as cells that are actively breaking down galactose.
If one of the L. lactis groups has a particularly high surface area-to-volume ratio, this could indicate that the cells in that group are particularly efficient at exchanging nutrients and waste, and thus may be more effective at breaking down galactose. However, other factors such as enzyme activity and gene expression could also play a role in determining how effectively the cells are able to break down galactose.
1. Students in a class are studying patterns of inheritance using genes involved in determining the body color and wing shape of Drosophila flies. Each of the genes has only two alleles, one of which is completely dominant to the other.
Each student in the class performed a parental cross between a fly that is true-breeding for ebony body and vestigial wings and a fly that is true-breeding for gray body and long wings. Each student then crossed several pairs of the F1 flies and determined the phenotypes of 500 of the resulting F2 flies with respect to body color and wing shape. The students in the class averaged their data for the frequencies of the four possible phenotypes (Table 1).
Table 1. Averaged
The two genes involved in determining body color and wing shape are likely assorting independently. This means that the inheritance of one gene does not affect the inheritance of the other gene, and the traits are inherited separately.
The parental cross between true-breeding flies for ebony body and vestigial wings and true-breeding flies for gray body and long wings produced F1 offspring that all had gray bodies and long wings. When the F1 offspring were crossed, the resulting F2 offspring showed a 9:3:3:1 phenotypic ratio, which is consistent with the inheritance of two independently assorting traits that are both determined by two alleles each. The 9:3:3:1 ratio is obtained when two heterozygous individuals (AaBb x AaBb) are crossed, where A and a represent the alleles for body color and B and b represent the alleles for wing shape. The phenotypic ratio is 9: A_B_ , 3: A_bb or aaB_ , 3: aaBb , and 1: aabb.
Learn more about genetics here.
https://brainly.com/question/30219841
#SPJ1
Question 12
The researchers predicted that they would see evidence of eutrophication in the upper estuary d
to its close proximity to urbanization, and that they would not see evidence of eutrophication in
lower estuary due to it being further away from urbanization.
Use complete sentences to write a conclusion discussing whether the data you calculated and
graphed supported this prediction or not, and why.
Edit View Insert Format Tools Table
12
12pt Paragraph ✓ BIUAT²V
The researchers' hypothesis that eutrophication was present in the estuary was partially supported by the calculated and analyzed data. According to the graph, dissolved oxygen concentrations decrease as the river moves further from the mouth, supporting the idea that eutrophication brought on by urbanization is occurring in the upper mouth.
The research, however, also suggests that there is a comparable drop in dissolved oxygen levels in the lower estuary, defying the assumption that eutrophication would not occur here. The observed decline in dissolved oxygen in the lower estuary may be due to other factors, such as agricultural runoff or natural processes.
Learn more about eutrophication, here:
https://brainly.com/question/13232104
#SPJ1
I put eggs in incubator at 99.5 degrees ferrinhiet for some reason incubator went to 114 degrees are embryos dead (macaw parrot eggs).
Answer:
Explanation:
Unfortunately, it is likely that the embryos in the macaw parrot eggs have died due to the high temperature of 114 degrees Fahrenheit (45.6 degrees Celsius). The optimal temperature for incubating macaw parrot eggs is around 99.5-100 degrees Fahrenheit (37.5-37.8 degrees Celsius), and temperatures outside of this range can have negative effects on the development of the embryos. In particular, high temperatures can cause the embryos to develop too quickly, which can result in developmental abnormalities and death.If you have any concerns about the viability of the eggs, you may want to consult with a veterinarian or experienced avian breeder for advice. They may be able to provide guidance on how to assess the status of the embryos and determine if any measures can be taken to improve their chances of survival.
Name the three possible ways pharyngeal slits can be present in a vertebrate.
Answer:
pharynx, throat and the outside
Explanation:
Pharyngeal slits are a third chordate feature; these are openings between the pharynx, or throat, and the outside. They have been modified extensively in the course of evolution. In primitive chordates, these slits are used to filter food particles from the water.
Explain how lymph nodes work. Explain what happens to the pathogens or foreign substance that enter a lymph node in the lymph
Select two words that tell how other members at the reform clud
The other two words that tell how other members at the reform club would most likely describe Phileas Fogg are:
refined
puzzling.
What is a reform club?The Reform Club is described as a private members' club on the south side of Pall Mall in central London, England.
The main character of Jules Verne's 1872 book Around the World in Eighty Days is Phileas Fogg. The American businessman George Francis Train and the American author and explorer William Perry Fogg served as models for the character.
Learn more about reform club at:
https://brainly.com/question/30586504
#SPJ1
Question 27 of 30
Which statement provides the best description of the relationship between
primary consumers and producers?
OA. Primary consumers provide producers with the chemical energy
they need.
OB. Primary consumers eat secondary consumers, which rely on
producers for food.
OC. Producers provide primary consumers with the chemical energy
they need.
OD. Producers and primary consumers compete with each other for
food sources.
The correct choice is:
OC. Producers provide primary consumers with the chemical energy
they need.
Primary consumers (e.g. herbivores) eat producers (e.g. plants) and gain their chemical
energy from the producers. The other choices do not accurately describe this producer-primary
consumer relationship.
OA. Primary consumers do not provide producers with chemical energy.
Producers provide chemical energy to primary consumers through photosynthesis.
OB. Primary consumers do not eat secondary consumers. Secondary
consumers eat primary consumers.
OD. Producers and primary consumers do not compete for the same
food sources. They occupy different trophic levels in the food chain.
Producers are the base of the food chain and primary consumers feed on them.
So the key relationship is that producers provide primary consumers
with chemical energy by being the base of the food chain and serving
as the primary food source for herbivores.
Our brain enables us to do all the following except blank a think b socialize c talk d move
Answer: B-socialize
Explanation:
the brain is only there for certain thing that deals with the human body all together, but socializing is your choice your brain dosent force you to do that .
The diagrams below represent rock layers found in two different locations by two different scientists. The scientist at location X used letters to label his rock layers, while the scientist at location Y used roman numerals to label her layers. Examine these diagrams and then answer the question that follows.The scientists both used the same colors and patterns to represent different types of rocks. They also used the same set of black-and-white symbols to represent specific types of fossils in the layers. By correlating layers based on fossils and rock types, the two scientists have discovered that certain rock layers are present in both locations.
Based on this information, if the age of layer R is 260 million years, then what other layer likely also has an age of 260 million years?
Answer:
Layers P,Q,R and S are the same as IV, V, VI and VII
Explanation:
Because of how the layers are being formed.
For more information ask your teacher or look in textbooks
How are Jim White and Charles David Keeling connected
Charles David Keeling and his colleagues Jim White are connected as they began measuring CO2 in 1958, which enabled us to have an excellent record of how CO2 concentrations have changed in the atmosphere over time.
Who is Charles David Keeling?Charles David Keeling was an American scientist whose recording of carbon dioxide at the Mauna Loa Observatory confirmed Svante Arrhenius's proposition of the possibility of anthropogenic contribution to the greenhouse effect and global warming, by documenting the steadily rising carbon dioxide levels.
Charles David Keeling measured CO2 in by having several 5-L flasks constructed with vacuum stopcocks and measured the volumes of the flasks from the mass they contained when filled with water.
Learn more about Charles David Keeling at: https://brainly.com/question/12519454
#SPJ1
Mammals have fur, they suckle their young and the young develop inside the mother. is it True or False
Answer:
True
Explanation:
This statement is true.
Mammals are defined by several characteristics, including the presence of fur or hair, the production of milk by the mother to nourish their young (which is known as lactation), and the development of the offspring within the mother's body before birth.
Hope this helps!
I really need help with Biology 102 ASAP!!!! but it's due date: Apr 26, 2023 at 11:59 PM EDT
Question 9 parts 1, 2 and 3
About 90 percent of the population is affected by type-2 diabetes while only 10 percent of the population gets type-1 diabetes. Both types can be managed using insulin.
In type-1 diabetes, the pancreatic cells are attacked, so a person can’t produce enough insulin. Ten percent of diabetics have this type of diabetes. It can be treated with insulin injections. People with this type have a greater risk of coma and death due to ketoacidosis or hypoglycemia.
In type-2 diabetes, insulin produced cannot be used properly. Most diabetics suffer from type. It can be managed through insulin or through exercise and diet.
To learn more about diabetes, refer to the link:
https://brainly.com/question/14823945
#SPJ1
(d) a species of intertidal plant has thick shiny leaves that reflect sunlight make a claim about which area of the intertidal zone this plant is best adapted to live in
Based on the description of the plant having thick, shiny leaves that reflect sunlight, it can be inferred that this plant is best adapted to live in the upper intertidal zone.
Where is the plant foundThe upper intertidal zone is the area that is exposed to air and sunlight during low tide and is submerged during high tide. Plants that live in this area are exposed to high levels of sunlight and heat, as well as desiccation (drying out) during low tide. Therefore, plants in this zone need to be adapted to withstand these harsh conditions.
The thick, shiny leaves of the plant described would help to reflect sunlight and reduce the amount of heat absorbed by the plant, which can help prevent overheating and damage from the sun. Additionally, the thickness of the leaves could help reduce water loss during low tide when the plant is exposed to air and is at risk of desiccation.
Read more on intertidal plant here: https://brainly.com/question/9228898
#SPJ1
Instructions: Develop a one-day diet plan for Kelly. She is a sedentary, 21-year-old lacto-
ovo-vegetarian who is 5'7 and weighs 155 pounds.. Use Cronometer as a tool to plan and
enter her diet. You may save a recorded one-day diet in this tool. Start off by recognizing her
protein requirement. Create a one-day menu plan (breakfast, lunch, dinner, and snacks) for
her. Each meal or snack must include protein. List two nutrients she might fall short in a
vegetarian diet, and list ways to replace those nutrients. As you are planning her diet, be sure
to meet 100 percent of protein, calcium, zinc, and iron needs.
Answer: As a sedentary, 21-year-old lacto-ovo-vegetarian weighing 155 pounds and standing at 5'7, Kelly needs approximately 56 grams of protein per day. It is important to note that vegetarians may fall short in certain nutrients, such as vitamin B12 and omega-3 fatty acids. To ensure that Kelly is meeting her nutritional needs, the following one-day diet plan has been developed using Cronometer as a tool:
Breakfast:
1 cup of oatmeal made with 1 cup of almond milk and 1 sliced banana (10g protein)
1 boiled egg (6g protein)
Mid-morning snack:
1 small apple (0.5g protein)
1 tablespoon of peanut butter (3.5g protein)
Lunch:
2 slices of whole wheat bread (8g protein)
2 tablespoons of hummus (2g protein)
1 cup of mixed greens (1g protein)
1 cup of cherry tomatoes (1g protein)
1/2 cup of edamame (11g protein)
Afternoon snack:
1 cup of Greek yogurt (17g protein)
1/4 cup of almonds (6g protein)
Dinner:
1 cup of quinoa (8g protein)
1 cup of roasted sweet potato (2g protein)
1/2 cup of chickpeas (6g protein)
1 cup of steamed broccoli (3g protein)
1/2 cup of sliced mushrooms (1g protein)
Total protein intake for the day: 65g
To ensure that Kelly is meeting her nutritional needs, it is important to note that vegetarians may fall short in certain nutrients, such as vitamin B12 and omega-3 fatty acids. To replace these nutrients, Kelly can consume fortified foods such as cereals, soy milk, and nutritional yeast for vitamin B12 and flaxseeds, chia seeds, and walnuts for omega-3 fatty acids.
Overall, Kelly's one-day diet plan includes a variety of plant-based protein sources such as oats, quinoa, edamame, and chickpeas. By using Cronometer as a tool, her diet plan meets 100 percent of her protein, calcium, zinc, and iron needs while also accounting for potential nutrient deficiencies in a vegetarian diet.
Part C: Take Notes In a separate location, take notes from the sources you have identified. The notes will provide details for your paper. While taking notes from texts and websites, use these reading strategies. In the space provided, write four pieces of information that you intend to use in your paper.
Four reading strategies that you can apply in your paperwork will include questioning, retelling, drawing inferences, and prediction.
How to apply the strategiesTo apply the strategies, you need to question what you read. This means not accepting everything that is said but questioning its validity. Also, you can retell the messages from the text and draw inferences from what is read.
The prediction will help you stay involved while taking notes. The pieces of information that you intend to use in your paper should be relevant to the topic of discussion.
Learn more about reading strategies here:
https://brainly.com/question/28831138
#SPJ1
I really need help with Biology 102 ASAP!!!! but it's due date: Apr 17, 2023 at 11:59 PM EDT
Question 9
Just click on a pics
Answer: Type 1 diabetes mellitus:
About 10% of diabetics have this type
A person does not produce enough insulin
Treated with insulin injections
Can lead to coma and death as built up ketones are converted to acids
Usually begins in childhood or adolescence
Long-term complications include blindness and cardiovascular disorders
Type 2 diabetes mellitus:
Most diabetics have this type
Cannot properly use produced insulin
Affects a person's ability to regulate glucose metabolism
Often develops in overweight or obese people
Long-term complications include blindness and cardiovascular disorders
Explanation: hope it helps
Type 1 Diabetes Mellitus:
About 10% of diabetes have this type
Can lead to coma and death as built up ketones are converted to acids
Cannot properly use produced insulin
Usually develops in childhood
Type 2 Diabetes Mellitus:
Most diabetes have this type
Often develops in overweight/obese people
Affects a person's ability to regulate glucose metabolism
Long-term complications include blindness and cardiovascular disorder.
Both:
A person does not produce enough insulin
Treated with insulin injections
Why is it important to look at environmental solutions from different perspectives?
Someone help me it's due today!
Filling out the table below using terms that describe gene and how to remember them are displayed below.
How to define genetic terms?Term | Definition | How will you remember?
Homozygous | Both alleles for a gene are identical | PP or pp
Heterozygous | Two different alleles for a gene | Pp
Phenotype | Physical expression of traits | What you see
Genotype | Genetic makeup of an organism | Letters that represent the alleles
Allele | Alternative forms of a gene | Letters that represent the versions of a gene
Dominant | An allele that is expressed when present | Represented by a capital letter (e.g. P)
Recessive | An allele that is only expressed in the absence of a dominant allele | Represented by a lowercase letter (e.g. p)
Table I.
TRAIT | YOUR PHENOTYPE | YOUR GENOTYPE(S)
Darwin's Ear Point | have | Pp
Hitchhiker's Thumb | Can bend more than 90 degrees | hh or Hh
Widow's Peak | Curved hairline | WW or Ww
Second Finger Shorter Than Fourth | Yes | Ss
Mid-digital Hair | Have hair | Hh or hh
Tongue Rolling | Can roll tongue | Rr or RR
Find out more on genetics here: https://brainly.com/question/12111570
#SPJ1
If the age of Layer 4 is 400 million years and the age of Layer 1 is 500 million years, then the age of Layer 5 is
If the age of Layer 4 is 400 million years and the age of Layer 1 is 500 million years, then the age of Layer 5 is younger than 400 million years.
The numerical ages of rock which are present on the Earth, in the Geologic Time Scale, are basically determined by the technique of radiometric dating, which basically uses the process which is known as the radioactive decay.
Since the age of the layer 1 amongst the rock layers is found to be 500 million years and that of layer 4 is found to be 400 million years then the age of the layer 5, which is the layer present above the layer 4 will have an age which is younger or lesser than 400 million years.
To know more about rock layers
https://brainly.com/question/315862
#SPJ1