Definition of float in the AudioEnglish.org Dictionary. Meaning of float. What does float mean? Proper usage and pronunciation (in phonetic transcription) of the word float. Information about float in the AudioEnglish.org dictionary, synonyms and antonyms.
Mammals evolved from a group of mammal-like reptiles called the Synapsids, specifically the Therapsids, in the Triassic period, around 250 million years ago.
The truth, though, is very different: in fact, the first mammals evolved from therapsids (mammal-like reptiles) at the end of the Triassic period, and coexisted with dinosaurs throughout the Mesozoic Era.idelphodon A Cretaceous ancestor of the modern opossum. Docodon Perhaps not a true mammal, but a mammal-like reptile.. Eomaia This early mammal is known from a single, spectacular fossil. Eozostrodon This Triassic critter may (or may not) have been the first true mammal.