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.
By the time they went extinct in the mid-Jurassic period, some therapsids had evolved various proto-mammalian traits (fur, cold noses, warm-blooded metabolisms, and possibly live birthing) that were further elaborated upon by their descendants, the true mammals.