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Answered 2008-05-04 19:55:00

External changes refer to environmental stimuli. External changes for an organism could include heat, light, temperature, and humidity. Homeostasis is a term that describes maintaining a steady environment. One example would include temperature regulation in the human species. When a human steps out into a cold environment, there are several homeostatic mechanisms which take place to maintain warm state within the body. Some of these mechanisms include vasoconstriciton of peripheral vessels, shiverring, and increased metabolic activity in an effort to generate more heat.

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