False.
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
What change occurs to your food by your teeth as you chew?
A. Physical Change Only
B. Chemical Change Only
C. Both Physical and Chemical
D. neither physical nor chemical change
Answer:
i think c
Explanation:
The change that occurs to the food by your teeth as you chew is both Physical and Chemical. The correct option is C.
What is chewing?Mastication, often known as chewing, is the process of reducing the size of solid food particles so that they can be taken more readily. Teeth are typically used as the surface for biting and grinding.
Chewing masticates, or grinds, food, which aids in physical digestion in the mouth. Salivary amylase, an enzyme that converts complex carbs into simple sugars, performs chemical digestion in the mouth. After the meal has been digested in the mouth, it forms a bolus or ball of food.
In your mouth, chemical digestion begins. Your salivary glands expel saliva into your mouth as you eat. Digestion begins chemically with the help of digestive enzymes found in saliva.
Therefore, the correct option is C. Both Physical and Chemical.
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Measuring Populations
When we think about the effects of air pollutants we immediately think of respiratory issues. Exposure to one criteria
air pollutant has harmful effects on the cardiovascular system including increased occurrence of heart attack and
stroke. These effects can result in emergency department visits, hospitalizations and, in some cases, premature death.
As expected, exposure to this pollutant is also linked to harmful respiratory effects, including asthma attacks. What is
this pollutant?
Explanation:
This pollutant is ozone, carbon dioxide, sulphur dioxide, carbon monoxide.
The large size (volume) of African elephants make it challenging to get rid of heat. They live in a hotter environment than Indian elephants so they have adapted by having larger, flat ears. This is an advantage because large, flat ears...
Select one:
a. give elephants a larger surface area to volume ratio so they can more efficiently get rid of heat
b. give elephants a smaller surface area to volume ratio so they can more efficiently get rid of heat.
c. are used to fan their body to remove heat by convection
d. give elephants a greater volume to help them stabilize their body temperature.
Answer:
a. give elephants a larger surface area to volume ratio so they can more Explanation:
because of the elephants large size they need bigger ears to cover more area to keep them cool
A student conduct an experiment to determine if the temperature of the water affected the breathing rate of the freshwater sunfish. Tempeture was measured in degrees Celisius and breathing rate was per minute
What is the independent variable and dependent variable
Answer:
the independent variable is the temperature and
the dependent variable is the breathing rate of the fresh water sunfish
(Brainliest at Random [for correct answers only]!!!!!)There are approximately 35,000 bald eagles in Alaska, which covers 586400 square miles. What is the population density for the bald eagles in Alaska?
C- 0.06 bald eagles per square mile
A carbohydrate that makes up the cell walls of plants:
Answer:
cellulose
Explanation:
humans have __ chromosomes in the nucleus of every cell in our bodys
Explanation:
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females.
James Watson and Francis Crick first discovered the structure of the DNA molecule in 1953. They discovered that the molecule has a shape specific to just that molecule. That shape can be best described as-
Answer:
A double helix
Explanation:
Effects of hurricanes
Answer:
Storm surge, tornadoes, heavy rainfall, high winds, riptide, and death are the most major effects of hurricanes. While a hurricane is approaching the coast, the sea level increases swiftly. Since the sea level rises, the amount of water can cause many deaths from drowning.
Explanation:
mark BRAINLIST
thx
Answer: They Produce strong winds and storm surge flooding,heavy rain fall that can result house and buildings flooding,and rip currents and it can also cause Tornadoes.
What is the definition of erosion in rock biology?
Answer:
Erosion is the process where rocks are broken down by natural forces such as wind or water. There are two main types of erosion: chemical and physical.All living things need to transport molecules from one place to another within the body in order to carry out necessary life functions. Water makes up approximately 60% of the human body. Which property of water best describes how it is able to transport these molecules from place to place and play such a vital role in life's functions?
Answer: Water as a universal solvent
Explanation:
Water is a universal solvent because of its property of dissolving a large number of molecules of different kind. The water at the biological level forms the major body weight of the organisms. It helps in supporting the cell metabolism and function. It is the main component of the liquid component of blood that is plasma. The water dissolved in it various vitamins, minerals, fibers, and other components of the food and helps in digestion of food in the body. Thus in human and animal body water plays an important role in circulation and digestion process.
How does a pond form?
A mudflow blocks a river.
Water collects in a low-lying area.
Humans use a dam to create a reservoir.
A depression made by an ice sheet fills with water.
Answer:r
the answer is B water collects in a low-lying area
Explanation:
Water gathers in hollows and low-lying regions of the ground, creating ponds and lakes. Therefore, option (B) is correct.
What is a pond?A space containing artificial or natural water that is smaller than a lake is called a pond. To separate their ecology from that of lakes and wetlands, they are defined as being smaller than 5 hectares in size, less than 5 metres deep, and having less than 30% emergent vegetation.
Water gathers in hollows and low-lying regions of the ground, creating ponds and lakes. They are a kind of shallow standing water where light may reach the sediments at the bottom and may promote the establishment of rooted plants all throughout the water body.
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Which base is found in DNA nucleotides, but not RNA nucleotides?
Answer:
The base found in RNA nucleotides, but not in DNA, is uracil.
Explanation:
why do you think that the water pressure in the lowest layer is so high?
Answer:
By understanding the manner in which temperature changes with height, we can become familiar with a ton about how ... of particles in less space, both air thickness and pneumatic force are higher. ... happen in the most minimal two layers: the lower atmosphere and the stratosphere.
Explanation:
My second best answer! 44732t4823
What are the primary of water pollution
It occurs when foreign harmful materials like chemicals, waste matter, or contaminated substances are directly or indirectly discharged into water bodies. ... Any alterations in the chemical, physical, or biological water properties qualify as water pollution.
When a rock first formed, it contained 8 milligrams of potassium-40. How much potassium-40 would remain after three half-lives?
1 milligram
O 2 milligrams
O 3 milligrams
O 4 milligrams
Answer:
l milligram
Explanation:
a cell is placed in solution which has the same solute concentration as the inside of the cell isotonic. because the concentration is the same on both sides of the membrane which direction will the water move via osmosis
Answer:
If a cell is in a medium with the same concentration of solutes with respect to intracellular space —isotonic— there will be no movement of water because there is no osmotic gradient or osmosis.
Explanation:
Osmosis implies the passage of water through a semi-permeable membrane from a place with a lower concentration of solutes to one where the concentration of solutes is higher. This difference in solutes concentration on both sides of the membrane produces an osmotic gradient, where the water will move towards the space with the highest concentration of solutes.
If a cell is in an isotonic medium —the same concentration of solutes inside and outside the cell— there is an equilibrium and the osmotic gradient is non-existent, so there is no movement of water or osmosis.
Refer to the diagram to complete the sentence with the
correct numbers.
When hydrogen shares electrons with oxygen, the
outermost shell of the hydrogen atoms are full with
electrons and oxygen's valence shell is full
with
electrons. Because the valence shells
of these atoms are full, the atoms are stable.
:H
Answer:
Refer to the diagram to complete the sentence with the correct numbers.
When hydrogen shares electrons with oxygen, the outermost shell of the hydrogen atoms are full with 2
electrons and oxygen’s valence shell is full with 8
electrons. Because the valence shells of these atoms are full, the atoms are stable.
Explanation:
Edge 2021
According to the electronic configuration, when hydrogen shares electrons with oxygen , hydrogen atom has 2 electrons and oxygen atom has 8 electrons.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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If you were to pour 4 different liquids into a glass and the liquids separated into 4 layers, which liquid would have the highest density?
A.
the second layer from the bottom of the glass
B.
the third layer from the bottom of the glass
C.
the layer at the bottom of the glass
D.
the layer at the top of the glass
Answer:
the layer at the bottom of the glass
Explanation:
because the last layer consists with so much energy so all the force is in the last layer.
Hi if it is wrong am sorry I tried but if it is right then am happy to help.
Does anyone have an answer for this???
Answer:
because the truck is moving
Explanation:
the force of the engine is bigger than the fractional force so the truck keep moving and do not stop.
Answer with Explanation:
The forces are unbalanced because the engine force (bigger force) and the friction force (smaller force) are not equal. Their difference in force is 40 N. This makes the truck move forward or in the direction of the bigger force. Its movement is being slowed down by the friction force.
Both of the forces are acting in opposite directions, but they are not equal in magnitude. Such occurrence can make an object either slow down or speed up. It could also change its direction. This is in accordance to "Newton's First Law of Motion."
why are our intercostal muscles important
What is the purpose of the sodium potassium pump
purpose
Explanation:
The concentration gradients. It moves two potassium ions into the cell where potassium levels are high, and pumps three sodium ions out of the cell and into the extracellular fluid.
osmosis involves movement of water through a semipermeable membrane, like the cell membrane t/f
Answer:
True
Explanation:
What is the correct complementary DNA strand for the sequence ATTGGCTAC
What is a type of cell that would contain many ATP molecules?
Answer:
Just as the chloroplasts in plants act as sugar factories for the supply of ordered molecules to the plant, the mitochondria in animals and plants act to produce the ordered ATP molecules as the energy supply for the processes of life. A typical animal cell will have on the order of 1000 to 2000 mitochondria.
Explanation:
The study of a cell is called cell biology.
The correct answer is mitochondria.
The cell is made up of various organelles which perform different functions. For example:-
Chloroplast - help in making food.Ribosome- help in making protein.The mitochondria are also known as the powerhouse of cells due to the production of ATP with the help of oxysome.
These ATP molecules are present and stored in the mitochondria.
Hence, the correct answer is mitochondria.
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Some athletes will consume a large amount of carbohydrates known as carbo loading. Why would this be advantageous to an athlete but, detrimental to the average person?
a. Carbohydrates are made of proteins which would help the athlete but, the average person doesn't need them.
b. Carbohydrates contain hereditary information that an athlete could use to build muscle but, the average person would not benefit.
d. Carbohydrates store and release energy which would be helpful to an athlete who burns a lot of calories but, for the average person it would be stored as fat.
Answer:
[tex]\boxed {\boxed {\sf Choice \ D}}[/tex]
Explanation:
The body easily breaks down and digests carbohydrates. They provide quick energy.
Athletes need energy to continue through an activity. Athletes can benefit from carbohydrates because they will provide a boost of sugar that can be converted to energy/ATP in cellular respiration.
For a normal person who doesn't burn large amounts of energy and calories, too many carbohydrates still provide a large influx of sugar. But it isn't turned into ATP because the body has no need for the extra energy. Instead, it is stored as glycogen in the liver or triglycerides in fat.
So, carbohydrates aren't made of proteins and they don't contain hereditary information. That leaves choice D as the correct answer: Carbohydrates store and release energy which would be helpful to an athlete who burns a lot of calories but, for the average person it would be stored as fat.
In other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. Say, for example, that an accidental chemical spill contaminates five ponds. To determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. This would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill.
Drag type of experiment on the left to the example of experiment on the right.
A. Natural
B. Manipulative
1. ______: Blood concentrations of BPA in college students are compared to their recent consumption of canned food items
2. _____: The feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams.
3. _____: The deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields.
4 ______: Tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory.
5. ______: Foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory.
6. ______: Growth of corn plants is compared in field plots sprayed with three different dosage:s of weed killer 7.
7. ______: BPA concentrations in the urine of people with diabetes are compared to BPA concentrations in the urine of people without diabetes
Answer:
1. Natural
2. Natural
3. Manipulative
4. Manipulative
5. Manipulative
6. Manipulative
7. Natural
Explanation:
1. Checking the blood concentration of BPA in college students in relation to their recent consumption of canned food items is a natural experiment because BPA concentration in blood is not artificially controlled by any means.
2. Comparing the feeding behavior of fish in streams with acidic runoff to that of fish in an unaffected stream is a natural experiment due to the fact that the acidity of the stream is not artificially controlled in any way by the experimenter.
3. Checking the deformity rate in baby birds from nests in pesticide-sprayed fields and that from unsprayed fields would require some manipulations except a sprayed and unsprayed one already existed long before the experiment was given birth to. Otherwise, the sprayed field might need to be artificially created just for the purpose of the experiment.
4. A known carcinogen would need to be administered to a group of the mice. This is manipulative.
5. The tadpoles would need to be artificially exposed to the toxic metals in the laboratory. Manipulative
6. The spraying would need to be carried out artificially in order for the comparison to be made. Manipulative
7. People with diabetes cannot be artificially created. They must have existed naturally long before the experimental design. Natural
5. Characteristics such as a widow's peak or attached earlobes are determined by
the genetic code. Which components of DNA are referred to as the genetic code??
Answer:
Explanation:
The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code.
What is the source of oxygen as a reactant in cellular respiration?
Answer:
The Reactants
What goes into the cell? Oxygen and glucose are both reactants of cellular respiration. Oxygen enters the body when an organism breathes. Glucose enters the body when an organism eats.
Explanation:
Hope this helped, Thanks :)
Cellular respiration has been the chemical process that uses glucose to produce energy. Oxygen is the reactant of the process that comes from the air (breathing) produced by photosynthesis.
What is cellular respiration?Cellular respiration has been defined as the process vital for living organisms that use oxygen and sugar molecules to produce energy to drive the activities and functions of the body. The reactant of the process includes glucose and oxygen gas.
Oxygen and sugar are known to be the product of the photosynthetic reaction that uses carbon dioxide and water. The oxygen gas is present in the atmosphere and enters the body through breathing.
Therefore, oxygen acts as a reactant in cellular respiration that comes from the breathing process.
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