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Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only withi

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Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C; a departure of a few

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Our story today is called To Build a Fire. It was written by Jack London and adapted by Dona de Sanctis. Here is Harry Monroe with the story. The man walked down the trail on a cold, gray day. Pure white snow and ice covered the Earth for as far as h