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What distinguishes mammals?

In: Mammals [Edit categories]

Answer:

Mammals have internal breeding and have sexual intercourse in order to fertalize the eggs. Other animals have external breeding where the female lays the eggs and then the male fertilizes it. In simpler terms, Mammals have sex, and other animals don't.

First answer by ID1153488908. Last edit by ID1153488908. Question popularity: 2 [recommend question].

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