Humans are evolving or losing a tail. Introduction: The tail is the portion of the animal's body that is located at the back; the phrase generally refers to a separate, mobile appendage to the midsection (torso). It is the area of the body that, in mammals, reptiles, and birds, generally corresponds to the coccyx and sacrum.

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Chapter 12, Problem 6SA

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To explain: Humans are evolving or losing a tail.

Introduction: The tail is the portion of the animal's body that is located at the back; the phrase generally refers to a separate, mobile appendage to the midsection (torso). It is the area of the body that, in mammals, reptiles, and birds, generally corresponds to the coccyx and sacrum.

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