4-Zoology-Kinds-Mammal-Theria

Theria as class

Mammals {Theria} can have live births, rather than eggs laid outside body, and mammary glands. Eggs develop inside body. Babies emerge in fetal stage, requiring care of young during gestation and after birth. Parental care causes adult-behavior imitation. Theria developed from monotremes. Theria include Eutheria and marsupials.

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Date Modified: 2022.0225