Answer:
B. 3.12 x [tex]10^{-3}[/tex] m
Explanation:
From the given picture, it can be deduced that;
the diameter of the image of lumen = 25.0 mm
= 25.0 ÷ 1000
= 0.025 m
And,
magnification = [tex]\frac{diameter of the image of lumen}{actual diameter of lumen}[/tex]
But magnification = 8,and diameter of the image of lumen = 0.025 m.
So that;
8 = [tex]\frac{0.025}{actual diameter of lumen}[/tex]
⇒ actual diameter of lumen = [tex]\frac{0.025}{8}[/tex]
= 0.003125
Actual diameter of lumen of the blood vessel is 3.12 x [tex]10^{-3}[/tex] m.
34. What had to form before cells could form?
(1 Point)
sulfur molecules
organic compounds
plants
oxygen gas
Answer:
B. organic compounds I think if it's wrong then it might be A. sulfur molecules
Organic compounds, fc a cell couldn't form until organic molecules united with one another to form more complex molecules.
Animals respond to stimuli by performing behaviours.
Predict the relationship between memory and behaviour?
Answer:
Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship. As a result of cold, winter weather (stimulus) some
hope this helps
Choose the answer that explains solar prominences
A. Sudden release of magnetic energy stored in the corona
B. Intense electromagnetic storms on the photosphere
C. Intense solar winds on the Sun’s surface
D. Storms of gas that form columns and shoot into space
Answer:
D - a solar prominence is a column of gas that stretches out from the sun's (or any other star's) surface
Answer:
B
Explanation:
It was right for me
(Urgent please answer!!) What molecule holds the code for controlling what a cell does
I believe it's DNA, or deoxyribonucleic acid.
What happens as electrons move along the chain of molecules known as the electron transport chain?
Answer:
In the electron transport chain, electrons are passed from one molecule to another, and energy released in these electron transfers is used to form an electrochemical gradient. In chemiosmosis, the energy stored in the gradient is used to make ATP.
What is one difference between natural selection and artificial selection?
a)Natural selection involves humans; artificial selection does not involve humans
b)Natural selection does not involve humans; artificial selection involves humans
c)Natural selection takes longer than artificial selection
d (Artificial selection only involves plants; Natural selection only involves animals
Answer:
B
Explanation:
Natural selection and selective breeding can cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but selective breeding only occurs when humans intervene. For this reason, selective breeding is sometimes called artificial selection.
I need help what’s this. it’s about heart rate
Answer:
During exercise, your heart typically beats faster so that more blood gets out to your body. Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps.
Explain the cause-effect relationship between environmental changes and the extinction of species.
Answer: Anything living needs to have certain conditions, if for example a group of flightless birds who are adapted for warm weather had their environment get colder each year and more extreme the surrounding plants and other animals may have a difficult time surviving and this will cause the birds to have less food. The birds also will not be accustomed to these changes and will not be able to adapt their bodies fast enough. This also makes reproduction difficult and in turn further dwindles the population.
Hope this helps!
Explanation:
With your partner, decide on a plan for investigating the effect of exercise on heart rate. The exercise could be running in place or doing jumping jacks. Record the steps below.
Pls I need the answer fast
Answer:
Materials
• Scrap piece of paper
• Pen or pencil
• Clock or timer that shows seconds or a helper with a watch
• Comfortable exercise clothes (optional)
• Calculator
Preparation
• Practice finding your pulse. Use the first two fingers of one hand to feel your radial pulse on the opposite wrist. You should find your radial pulse on the "thumb side" of your wrist, just below the base of your hand. Practice finding your pulse until you can do it quickly. (You can alternatively take your carotid pulse to do this activity, but be sure you know how to safely take it and press on your neck only very lightly with your fingers.)
• Measure your resting heart rate, which is your heart rate when you are awake but relaxed, such as when you have been lying still for several minutes. To do this, take your pulse when you have been resting and multiply the number of beats you count in 10 seconds by six. This will give you your resting heart rate in beats per minute (bpm). What is your resting heart rate? Write it on a scrap piece of paper.
• You will be measuring your heart rate during different types of physical exercises over a period of 15 minutes. Choose at least two different exercises. Some examples include jumping rope, lifting a two-pound weight, riding a bike, hula-hooping, walking, etc. Gather any needed materials. (If you want to make a homemade hula-hoop, steps for doing this are given in the activity Swiveling Science: Applying Physics to Hula-Hooping .) Do you think the activities will affect your heart rate differently? How do you think doing each activity will affect your heart rate?
Procedure
• Choose which exercise you want to do first. Before starting it, make sure you have been resting for a few minutes so that your heart is at its resting heart rate.
• Perform the first exercise for 15 minutes. While you do this, write down the number of beats you count in 10 seconds after one, two, five, 10 and 15 minutes of activity. (You want to quickly check your pulse because it can start to slow within 15 seconds of stopping exercising.) How do the number of beats you count change over time? How did you feel by the end of the exercise?
• Calculate your heart rate after one, two, five, 10 and 15 minutes of exercise by multiplying the number of beats you counted (in 10 seconds) by six. How did your heart rate (in bpm) change over time?
• Repeat this process for at least one other exercise. Leave enough time between the exercises so that your heart rate returns to around its normal resting level (this should only take a few minutes). How did you feel by the end of the second exercise? How did your heart rate change over time for this exercise?
• Take a look at the results you wrote down for this activity. Which exercise increased your heart rate the most? Which exercise increased your heart rate the fastest? Which exercise(s) elevated your heart rate to the target heart rate zone (50 to 85 percent of your maximum heart rate, where your maximum heart rate is 220 bpm minus your age)? Do you notice any consistent patterns in your results?
• Extra: Try this activity again but test different physical exercises. How does your heart rate change when you do other exercises? How are the changes similar and how are they different?
• Extra: Measure your heart rate while lying down, while sitting down, and while standing. How does your heart rate change with body position?
• Extra: Repeat this activity with other healthy volunteers. How does their heart rate compare to yours? How does their change in heart rate while exercising compare to how yours changed?
• Extra: Try this activity again but vary the intensity of your exercise. What intensity level elevates your heart rate to 50 percent of its maximum heart rate? What about nearly 85 percent of its maximum? Be sure not to exceed your recommended target heart rate zone while exercising
Explanation:
If you did a moderately intense exercise, such as walking, you may have seen an initial jump in your heart rate (where your heart rate falls within the lower end of your target heart rate zone within about one minute of exercise), but then your heart rate only slowly increased after that. After 15 minutes, you may have reached the middle of your target heart rate zone. To reach the upper end, people usually need to do a moderately intense exercise for a longer amount of time (such as for 30 minutes). If you did a more strenuous exercise—hula-hooping, for example—you may have seen a higher initial bump in your heart rate (such as reaching the middle of your target heart rate zone after just one minute of exercise), and then your heart rate stayed about the same for the remaining 14 minutes of exercise. Overall doing a more strenuous exercise generally raises a person's heart rate faster compared to doing an exercise that is only moderately i
Rearrange the following information into a food chain. Label the role of each organism in the chain
• Water fleas eat algae
• Diving beetles eat young dragonflies
• Pike eat perch
• Perch eat diving beetles
• Young dragonflies eat water fleas
summarize the future use of dna technology here in 20 words or more
Answer:
DNA testing has gone mainstream. The cost of DNA sequencing has reduced faster than Moore's Law. With an estimated cost of $100 in the foreseeable future, DNA sequencing becomes more accessible and opens up new use cases, such as wider adoption of population sequencing
Explanation:
3. Which is an example of genetic biodiversity?
a. Different skin color within a species
b. Different types of species in an ecosystem
C. Every organism has the same genetic sequence
d. All populations look identical within a species
Answer:
A
Explanation:
Has to be the same family to be genetic and you have to find which has the most variety
Different skin color within a species is an example of genetic biodiversity. Therefore, option (A) is correct.
What is genetic biodiversity?
Genetic biodiversity refers to the variety of genes and genetic traits that exist within a population or species. It is a fundamental aspect of biodiversity, as it underpins the ability of species to adapt to changing environmental conditions and to maintain resilience in the face of threats such as disease, climate change, and habitat loss.
Genetic biodiversity arises from mutations, genetic recombination, and other processes that generate new genetic variation within populations. This diversity provides the raw material for natural selection to act upon, allowing organisms with advantageous traits to survive and reproduce.
Genetic biodiversity is important for ecosystem functioning and for the conservation of species, as it helps to ensure that populations are able to adapt to changing conditions and maintain their long-term viability. The loss of genetic biodiversity can have significant negative impacts on populations and ecosystems, making it an important focus of conservation efforts.
Learn more about genetic biodiversity, here:
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Describe a DNA molecule and its shape
Answer:
DNA is a long molecule, made up of two strands twisted together to make a spiral known as a double helix.
Suppose scientists determine that a set of genes is significantly more prevalent in murderers than in the population at large. Would that mean that murderers are not at fault for what they do? Why or why not?
Answer:
No
Explanation:
That a gene is common to all murderers in the population does not mean that murderers are not at fault for their crimes.
Having a gene that correlates with murder just gives one a genetic tendency but the environment and personal choice still have to influence the decision to commit the crime. In other words, one might have the genetic tendency to commit murder but still has to be environmentally enabled and the ability to choose to either do it or otherwise. Nature, nurture, and personal choice would have to synergistically work together for the phenotypic expression of such a gene.
PLEASE HELP! Describe what you know about enzymes that explains your evidence and your claim.
Use the words: pH, substrate, product, active site, 3D shape, denature, and hydrogen bonds.
https://brainly.com/question/20699338 (link to other post w/ same question 18 point reward!!!)
Claim: The optimum pH environment for catalase is approximately pH 7.0 and thus has the highest activity in a neutral pH environment. If the solution is too acidic or too basic the catalase is inactive and no longer functions as an enzyme.
Answer:
In the case of catalase, the optimum pH is approximately pH 7.0. That is, catalase works best at a neutral pH. If the solution is too acidic (low pH value) or too basic (high pH value) the catalase is inactive and no longer functions as an enzyme.
hope this helps!!:)
Explanation:
1 which characteristic of life describes the life cycle of a butterfly?
A Crowing and developing
B. Using energy
CHaving cells
D. Responding to its environment
Many cities contain green areas, such as the park shown in the image below.
How do such roadless areas make a city more sustainable?
Answer:
Its A.
Explanation:
I just took the quiz trust me :D
Answer:
They provide high-density urban areas with space for outdoor recreation.
Explanation:
I just took the quiz.
A chemist reacts 44.99 g of H2O and 211.51 g of CO2 as shown below.
H2O + CO2 --> C7H8 + O2
Part a) Calculate the maxium mass of C7H8 that can be produced.
Part b) Identify the limiting reactant.
Part c) Calculate the maximum mass of O2 that can be produced from this reaction.
Part d) When complete, the reaction actually produced 136.78 g of O2. Calculate the percent yield.
Select all answer choices that apply to questions a-d.
Note: calculated values are rounded to 2 decimal places.
Group of answer choices
150.46
197.73
179.76
CO2
57.51
76.09
63.26
H2O
Head injuries and spine injuries are very worrisome because:
A. Nerve cells go through cell division frequently
B. Skin cells go straight from First Growth to Synthesis phase
C. Skin cells go through cell division frequently
D. Nerve cells stay in G Zero phase after the first growth
PLEASE ANSWER QUICK>>>>>Explain how enherited traits are determined
Answer:An inherited trait is one that is genetically determined. Inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment.
Explanation:
Which description properly describes the plant structures involved in photosynthesis
Answer:
Stomata take in water, sunlight, and carbon dioxide and release oxygen. Phloem transports water, stomata take in carbon dioxide, and chlorophyll absorbs sunlight. Xylem takes in water, sunlight, and carbon dioxide and releases oxygen.
Answer:
Sorry, but I don'y know
Explanation:
what do you call humid air mass that forms over water in cold areas?
What happens when an ecosystem undergoes eutrophication?
Answer:
Eutrophication sets off a chain reaction in the ecosystem, starting with an overabundance of algae and plants. The excess algae and plant matter eventually decompose, producing large amounts of carbon dioxide. This lowers the pH of seawater, a process known as ocean acidification.
How is an open system different from a closed system?
A. An open system does not follow the law of conservation of mass while a closed system does.
B. An open system is not balanced.
C. An open system allows matter to enter and leave during a chemical reaction, while a closed system does not.
D. Open systems will be scals prior to initiating the reaction.
Which trait is controlled by three or more genes?
A:seed color in pea plants
B:feather color in roosters
C:fur color in palomino horses
D:hair color in humans
Answer: D:Hair color in humans
Explanation:
I NEED HELP WILL GIVE CROWN FOR TWO CORRECT ANSWERED QUESTIONS
Answer: 4. H
Explanation:
Which of the following represents the concept of RNA?
a) It consist of one strand.
b) It's sequence comes of the DNA strand.
c) Instead of Thymine, it uses Uracil as a nitrogenous bases.
d) All of the above.
Answer:
D is the answer please answer the
The nucleus is the cell as:
A) The bones are to a human.
B) The heart is to human.
C) The muscles are to a human.
D) The brain is to a human.
Answer: D) The brain is to a human
Explanation: Nucleus is like the brain in the cell it basically helps the cell to function just the same as how the brain makes a human function properly.
Shortly after ingesting a big plate of carbohydrate-rich pasta, you measure your blood's hormone levels. What results would you expect, compared to before the meal
Answer:
blood hormone level will increase
Explanation:
since once food reach the stomach it will trigger different hormone process that cause release of enzymes required to digest carbohydrate
After ingesting a plate of pasta, which is rich in carbohydrates, the levels of insulin increases and glucagon decreases in the blood.
The working of insulin and glucagon:The hormone insulin and glucagon work in a negative feedback loop. At the time of digestion, the foods, which comprise carbohydrates are transformed into glucose. The majority of this glucose is sent to the bloodstream, resulting the elevation of blood glucose levels.
This enhancement in the levels of glucose in the blood signals the pancreas to generate insulin, and reduce the levels of glucagon in the blood. After some hours, glucagon works to counterbalance the activities of insulin.
After five to six hours, the levels of glucose in the blood decreases due to the activity of insulin, this instigates the pancreas to generate glucagon.
Thus, after eating carbohydrate rich food, the levels of insulin increases in the blood and glucagon decreases.
Find out more information about insulin and glucagon here:
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Would a cell that did not undergo cytokinesis be able to function properly? Explain.
Answer:
If cytokinesis wouldn't really occur, the cytoplasm would not be broken and two similar daughter cells would not function as a result. Therefore a cell should not be divided into two separate cells to stay at rest.
Explanation:
Cytokinesis, which is the final step of mitosis, is split into two isolated, equivalent daughter-cells by the material.