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The success of mammals is credited to holding constant their:

ABody colour tone
BBody size shape
CBody temperature
DBody mass value
Answer & Solution
Correct answer: C. Body temperature
1. Mammals live from Antarctica to the Sahara. 2. They keep their internal state steady across that range. 3. That constant body temperature underlies their success. _Source: syllabus Biology, Chapter 13, Organisms and Populations._
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