All of the traits below are characteristic of the class Mammalia except C.Oviparous birth of young as they do not lay eggs.
Animals that reproduce via way of means of laying eggs are referred to as oviparous animals. In those animals, the manner of each fertilization and embryo improvement does now no longer arise within the mother. Birds and frogs are examples of oviparous animals.
Most mammals are viviparous, giving beginning to stay young. However, the 5 species of monotreme, the platypuses and the echidnas lay egg.
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