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Homeostasis

By Laura Klappenbach, About.com

Definition:

n. "Maintenance of constant internal conditions in the face of a varying external environment." (Source: Ricklefs)

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Examples:
The thickening of fur in winter, the darkening of skin in sunlight, the seeking of shade in heat, and the production of more red blood cells at high altitude are all examples of adaptations animals make in order to maintain homeostasis.

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