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 are cold-blooded. That is, they lack the ability to regulate their metabolic heat (heat derived from the oxidation, or burning, of food and from other processes) for the production of sustained body warmth and a constant body temperature.Cold-bloodedness, however, does not mean that a reptile is necessarily cold.he class Reptilia (living and extinct reptiles) is divided into 6 to 12 subclasses by different authorities. A number of these subclasses are completely extinct. The subclasses contain about 24 orders, but only 4 of these are still represented by living animals.