It is a theory because it is a statement of fact that does not include an explanation.
A, carbohydrates
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Cells are affected by the movement of water through osmosis. Osmosis is a natural phenomenon in which molecules move from lower concentration to higher concentration. This movement depending on the solution type of the environment can either shrink or burst or oversaturate a cell.
Explanation:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart.
<span>c. they combine gene pools . they pass on genes that allowed them to survive .
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