If a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying? A. An individual organism
B. A community
C. A population
D. An ecosystem

Answers

Answer 1

Answer: A because an ecosystem includes all the living and nonliving things within an area :)

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What evidence of body segmentation do lancelets display?

Answers

Lancelets have a somewhat fish-like body. However, the don't have fins or any other limbs. They are not good swimmers, and have a relatively poorly developed tail. Moreover, they do not possess a true form of a skeleton, they just have some gill slits, mouth and that tail I already mentioned.

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Most living things need oxygen to survive. You breathe in oxygen and it is carried to this organ. Here the red blood cells pick up the oxygen and carry the oxygen to all the body cells that need it. What is this organ?A) diaphragm
B) heart
C) lungs
D) trachea

Answers

Answer:

The correct answer would be the C) lungs.

Lungs are the pair of air-filled spongy organs.

They are mainly associated with the exchange of gases (carbon dioxide and oxygen) in the body.

The alveoli are the group of tiny air-sacs present in the lungs which form the site of gas exchange.

The oxygen from the alveolar site diffuses into the blood and carbon dioxide from the blood diffuses into the alveolar site.

The oxygen is then transported to all cells of the body with the help of circulatory system whereas carbon dioxide is removed out of the body as a part of exhaled air.

C) the lungs.
The air moves down the trachea and into the lungs where it is picked up by the blood

Which chamber of the heart exits into the pulmonary trunk?

Answers

Answer: the right ventricle

Explanation:

The pulmonary trunk originates from the right ventricle through which deoxygenated blood is pumped into the lungs.

The pulmonary trunk divides into right and left pulmonary artery which carries blood to their respective lungs.

Blood flow into the pulmonary trunk is regulated by the semilunar valve.

Final answer:

The right ventricle of the heart exits into the pulmonary trunk. This process is part of our body's pulmonary circulation, responsible for oxygenating blood.

Explanation:

The chamber of the heart that exits into the pulmonary trunk is the right ventricle. In the human heart, blood flows from the right atrium into the right ventricle after which it's pumped out of the heart into the pulmonary trunk. This blood then splits between the two pulmonary arteries that carry it to the lungs where it gets oxygenated. This process is part of the pulmonary circulation which is responsible for oxygenating blood. It's crucial for maintaining the body's overall oxygen levels and blood supply.

Learn more about Pulmonary Trunk here:

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Jacqueline is trying to draw an image of a cell in telophase. Which describes what she should draw?a cell with chromosomes together in the nucleus
a cell with two distinct nuclei
a cell with chromosomes pulling apart
a cell with chromosomes lined up in the middle

Answers

A cell with two distinct nuclei

Answer:

Explanation:

The cell grows to its full size.

The owners of a shopping mall wanted to determine whether the more expensive Tough Stuff floor wax was better than the cheaper Steel Seal floor wax at protecting its floor tiles against scratches. Therefore, a section of the floor at one of the entrances has been designated to be used for this experiment.What is the independent variable and what is the dependent variable?

Answers

Answer:

floor tiles is dependent

wax is the independent

Explanation:

floor tiles needs to depend on the wax to not get scratches

wax does not need to depend on anything

Final answer:

The type of floor wax (Tough Stuff or Steel Seal) is the independent variable, being manipulated for the experiment, while the level of protection against scratches is the dependent variable, being measured and compared.

Explanation:

In this experiment, the independent variable is the type of floor wax being used (either Tough Stuff or Steel Seal), as this is the factor that is being systematically manipulated to determine its effect on the outcome. The dependent variable is the level of protection the floor tiles have against scratches, which is what is being measured and compared between the different wax types.

The independent variable in this experiment is the type of floor wax being tested, with the two options being the more expensive Tough Stuff floor wax and the cheaper Steel Seal floor wax. The dependent variable is the level of protection provided by the floor wax against scratches on the floor tiles.