How is food in your digestive system like a finger in a doughnut hole?

Answers

Answer 1

Answer: Just like how your finger isn't really "in" the doughnut, it's in the hole; food isn't in your digestive system, it's technically moving through the "hole" in your body. It's moving from your mouth to your anus, not in your body. This is because the material in your body is eventually absorbed.

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1. What function does the shape of the star-nosed mole's nose serve?- It helps the mole breath under water
-It helps the mole eliminate excess heat.
- It helps the mole find food.
- It helps the mole dig out its burrow.

Answers

The star-nosed mole does prefer wet, poorly drained areas and marshes. It is a good swimmer and can forage along the bottoms of streams and ponds.
The best answer to the question above is the second option.It helps the mole eliminate excess heat.

One-celled organisms, such as bacteria, can reproduce very quickly using the process called _____. budding binary fission cytokinesis duplication

Answers

The correct answer is binary fission.

It is the process by which prokaryotic cells produce new cells that are genetically similar to the parent cell. It is an asexual kind of reproduction.

it occurs in three main steps

1. DNA replication to make a set of two chromosomes.

2. Chromosome segregation where the two chromosomes separate.

3. Cytokinesis, a process in which a new plasma membrane begins to form in the center of the cell followed by the splitting of the cytoplasm into two, and two daughter cells are formed which are genetically similar to each other and to the parent cell.

Which of the following accurately reflects the beliefs on Earth's early history?a. Scientists believe that microspheres nearly prevented the development of early life.
b. Scientists believe that DNA may have existed before RNA.
c. Scientists believe oxygen was plentiful in the early atmosphere.
d. Scientists believe the early atmosphere lacked the oxygen necessary to support modern human life.

Answers

The correct answer is D.
From the scientific research conducted so far, we know that in the early Earth's history the atmosphere lacked oxygen and was mostly filled with other gases like methane. The increase in oxygen levels happened when the plants started producing oxygen as a byproduct of the process of photosynthesis.
The research so far also shows that the RNA was present before the DNA and that the microspheres might have been essential to the development of life on Earth.

Correct answer is D.

How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at –9°C to water at 0°C? A. 3.26 MJ
B. 2.48 MJ
C. 3.09 MJ
D. 2.13 MJ

Answers

The heat required to change the phase of a substance can be calculated by using the formula,

q = mCΔT where q is the heat needed, m is the mass of the substance, C is the specific heat capacity and ΔT is the change in temperature.

q = 7000 g (4.18 J/ g °C) (0°C - (-9°C))
q = 263340 J or .26334 MJ

I think the answer is not given in the choices.

I think the answer is B. 2.48 MJ, correct me if I’m wrong I’m studying this

Antibodies are produced when the body is exposed toA. white blood cells.
B. receptor proteins.
C. antigens.
D. macrophages.

Answers

Antibodies are produced when the body is exposed to antigens.

During an initial encounter with a foreign antigen, the body's immune system namely the adaptive arm of the immune system, produces memory cells, a group of special lymphocytes that retain and store memory of the antigen.

On a second encounter with the same kind of antigen, the immune system "remembers" the antigen and mounts a rapid, specific and vigorous immune response against the antigen. This response includes the production of massive amounts of antibodies very specific to the antigen.

The antibodies effectively neutralize the antigen and facilitate its destruction.

Answer:

C. Antigens

Explanation:

Antibodies a protein formed by immune-responsive cells that is specific for a particular antigen and can bind to it to inactivate or destroy it.

Hope that helps!!

Which of the following occurs in the upper respiratory system? A)air enters the alveoli
B)air enters the bloodstream
C)air is filtered and moistened
D)air is delivered to muscles

Answers

The correct answer is Option C

The air enters the nasal cavity and it is filtered and moistened their. This is done by the mucous membrane that is present on the inner side of the nasal passage.

The air is filtered and the dust particles gets attached to the mucous and the filtered air is send inside for the exchange of gases.

c.............................

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