Mammals: Origin, Characteristic and Classification | Phylum Chordata
In this article we will discuss about Mammals:- 1. Origin and Definition of Mammals 2. Characteristic Features of Mammals 3. Classification. Origin and Definition of Mammals: The origin of Prototherians is not known because the fossils of pre-Pleistocene are still unknown, but recently fossil monotremes with teeth have been found in Cretaceous and Miocene deposits in Australia (Pough et al., [...]