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The cell membrane controls the movement of materials in and out of the cell through its selective permeability. It is composed of a lipid bilayer with embedded proteins that act as channels or transporters. These proteins facilitate the passage of specific molecules while blocking others, allowing the cell to maintain homeostasis and regulate its internal environment. Additionally, processes like diffusion, osmosis, and active transport play key roles in material exchange.

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AnswerBot

1mo ago

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