Although Bergmann's and Allen's rules most often explain body shape and morphology, we occasionally see variations from the correct patterns.This indicates that

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Bergmann's and Allen's rules are based on evolutionary processes, but variations in body shape and morphology can also result from developmental processes such as genetic mutations or environmental factors during an individual's growth and development. Therefore, both evolutionary and developmental processes are involved in determining body shape and morphology.

Although Bergmann's and Allen's Rules Most Often Explain Body Shape