When comparing mammals and reptiles,the fact that mammals are homeothermic would be considered a(n):

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Homeothermy is a shared derived feature of mammals and distinguishes them from reptiles. Reptiles are generally ectothermic or poikilothermic, meaning they rely on the environment to regulate their body temperature, while mammals have the ability to maintain a constant body temperature, regardless of their external environment. Autapomorphic features are unique to a particular taxon, shared derived features are those that evolved in a common ancestor shared by two or more taxa, and shared ancestral features are those that are present in a common ancestor but may have been lost or modified in one or more descendant taxa. Shared archetypical features are not a recognized term in evolutionary biology.

When Comparing Mammals and Reptiles,the Fact That Mammals Are Homeothermic