The ability of mammals to maintain a constant body temperature allows them a wide range of adaptation.They are considered to be:

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Mammals are homeotherms, which means that they are able to maintain a constant internal body temperature regardless of external environmental conditions. This ability allows them to adapt to a wide range of environments and ecological niches. Pre-adaptation refers to a trait that originally evolved for a different purpose but later becomes useful in a new context. Clinal adaptation refers to gradual changes in a species' traits along a geographical gradient. Radiotherms are organisms that are able to tolerate a wide range of temperatures. Isotherms refer to lines on a map connecting points with the same temperature. None of these terms accurately describe the adaptability of mammals due to their ability to maintain a constant body temperature.

The Ability of Mammals to Maintain a Constant Body Temperature