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20. Which of the following is an example of homeostasis?

A human participates in vigorous activity on a hot day and eventually suffers from dehydration.
A human body loses too much heat on a cold day, and hypothermia occurs.
A cactus stores water during wet periods, allowing it to live through dry periods.
A snake rests in the sun on a summer day, and its body temperature eventually becomes too hot for survival.

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natcurren17
A cactus stores water during wet periods, allowing it to live through dry periods.
SchwarzschildRadius
Well,

Homeostasis means "maintaining the status quo."  That just means remaining the same.

The first, second, and fourth options, do not represent homeostasis, as something happens to the organism that is not normal.

The third example is an example of homeostasis because the cactus is preparing for the dry period, during which it can maintain the status quo because of its stored water.

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