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The body temperature of a mammal has to be maintained at a fairly constant level because

The body temperature of a mammal has to be maintained at a fairly constant level because
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  • A Excessive heat is continually lost by the body to the environment
  • B Their body temperature is always higher than that of the environment
  • C Evaporation of sweat cools the body
  • D Metabolic activities function best at certain temperature
Correct Answer: Option D
Explanation:

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