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GRE写作范文——Cells and Temperature.

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  Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of fective functioning. Enzyme systems of mammals and birds are most ficient only within a narrow range around 37C;a departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fluctuations the integrated actions of bodily systems are impaired. Other animals have a wider tolerance for changes of bodily temperature.

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