What is homeostasis and what is the main way that the cell membrane maintain homeostasis

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Q. What is Homeostasis?

A. Homeostasis is the ability of the body to maintain a stable internal environment despite changes in external conditions. For example when its really hot outside (External condition) you start sweating (you starting to sweat is your body trying to maintain a stable internal environment) and that's how your body helps itself to cool down  (it sweats to cool down).

Q. What is the main way that the cell membrane helps maintain homeostasis?

A. The main way the cell membrane helps maintain homeostasis is by allowing substances in and out of the cell.

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b. lithosphere, asthenosphere, mesosphere   is the answer most likely