Thursday, 8 December 2011
Wednesday, 7 December 2011
An invertebrate is an animal without a backbone.
An invertebrate is an animal without a backbone. The group includes 95% of all animal species[1] — all animals except those in the chordate subphylum Vertebrata (fish, amphibians, reptiles, birds, and mammals).
Facts about Reptiles
Reptiles are a group of vertebrate animals. The name "reptile" comes from Latin and means "one who creeps". All living reptile species are cold blooded, have scaly skin, and lay cleidoic eggs. They also have some less obvious features. They excete uric acid (instead of urea), and have a cloaca. A cloaca is a common vent (opening) for the intestines, urinary tract and reproductive ducts. Reptiles also share an arrangement of the heart and major blood vessels which is different from that of mammals.
Facts about mammals
Mammals (formally Mammalia) are a class of vertebrate, air-breathing animals whose females are characterized by the possession of mammary glands while both males and females are characterized by sweat glands, hair and or fur, three middle ear bones used in hearing, and a neocortex region in the brain.
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