Did mammals as a whole evolve from reptiles or birds?
The evolution of mammals within the synapsid lineage (sometimes called "mammal-like reptiles") was a gradual process that took approximately 70 million years, beginning in the mid-Permian. By the mid-Triassic, there were many species that looked like mammals, and the first true mammals appeared in the early Jurassic. So they evolved from reptiles. ChaCha
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