Although egg-laying is rare in mammals, it is common for other amniotes. The fact that monotremes, such as the platypus, lay eggs
A. suggests this is an ancestral trait in tetrapods, while internal gestation is derived
B. demonstrates that the shelled amniotic egg evolved multiple times.
C. helps the species support an ectothermic life style.
D. indicates that they are more closely related to reptiles than to other mammals
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