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.
Reptiles were able to develop from a species of amphibians because all organisms are able to evolve through natural selection and genetic drift. All organisms experience a change over time. A group of amphibians spent less time in the water, evolved dry skin and hard-shelled eggs and became the first reptiles.