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.
One has to go back to a period 250 million years ago when the transition to mammals began in the form of mammal-like reptiles. Mammals evolved from a group of reptiles called the synapsids. These reptiles arose during the Pennsylvanian Period (310 to 275 million years ago).A branch of the synapsids called the therapsids appeared by the middle of the Permian Period (275 to 225 million years ago).HE EVOLUTION OF MAMMALS. The changes from a reptilian to a mammal's lifestyle is significant. Reptiles are cold-blooded, relying on external heat sources to raise their body temperature to a point necessary for activity.