The need for homeostasis applies to even one of the smallest living units, cells. The cell membrane controls what goes in and out of the cell. How could the cell membrane then be important for homeostasis?

The cell membrane maintains the homeostasis throughout a cell because it filters what substances go in and out of the cell. If there is too much of a substance in a cell the plasma membrane quickly disposes it and when there is not enough of a substance in a cell the plasma membrane lets the substance in.

Explanation:

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layer 3 is younger than layer 6.