Even though conditions in the external environment may vary widely, most organisms must keep internal conditions such as temperature and water content fairly constant to survive.
The tendency to maintain a stable, relatively constant internal environment is called homeostasis. The body maintains homeostasis for many factors in addition to temperature. For instance, the concentration of various ions in your blood must be kept steady, along with pH and the concentration of glucose. If these values get too high or low, you can end up getting very sick.
Learn what best describes homeostasis?
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