Water diffusion is called osmosis. Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
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A.
Explanation:
All of them have an a and only two have a B. Thats my best guess
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The reaction of iodine and starch turns the solution blue
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it controls the heartbeat and movement of food
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