By controlling what enters and leaves a cell, the cell membrane A) aids in maintaining homeostasis within the cell. Homeostasis is the process by which organisms maintain life through eating, growing, and living in variable conditions. It would not make sense to answer B) because organisms do not control the homeostasis of their external environment. D) also would not be correct because cell's do not control osmosis in the external environment. The membrane does not control osmosis because osmosis is generally a random process of molecular diffusion whereas the membrane acts in a conscious and controlled way.
By controlling what enters and leaves a cell, the cell membrane A) aids in maintaining homeostasis within the cell.
The cell membrane controls what enters and leaves the cell to aid in maintaining homeostasis within the cell. It is selectively permeable, ensuring essential substances can enter while harmful ones are kept out. Therefore, the correct answer is A) aids in maintaining homeostasis within the cell.
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