A baby has been born with a small tail. It is the case exhibiting

retrogressive evolution

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mutation

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atavism

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metamorphosis

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Solution

The correct option is C atavism
The phenomenon of sudden reappearance of some ancestral features is called atavism. The appearance of ancestral characters in the newborn such as large canines, thick body hairs, short temporary tails, gill slits, additional pairs of nipples etc are examples of atavism.

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