Asked in Mammals

What advantage did early mammals have over reptiles?



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Being warm-blooded a mammal's metabolism is better suited to an active lifestyle as it generates heat more efficiently to power its own chemical processes. A reptile would have to spend some time basking in the sun in order to do that, exposing themselves to danger and wasting time warming up while they could be looking for food or looking for a mate.

Both groups' reproductive strategies are adapted to land but mammals' young develop inside the womb and most look after their young while a reptile lays hard-shelled eggs and most don't look after their offspring.