The primary distinguishing characteristic of all mammals is the presence of

Name: The primary distinguishing characteristic of all mammals is the presence of
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Mammals are defined by the presence of hair and mammary glands which produce milk for their offspring. While some mammals do have a constant internal temperature and a four-chambered heart, these are not defining characteristics of the group as a whole. Limb count varies among different types of mammals, and only some mammals have placentas.

The Primary Distinguishing Characteristic of All Mammals Is the Presence