Subfilum of vertebrates is Chordata, which includes all animals have a spine that is composed of vertebra. Vertebrata is the largest subfilum of Chordata. Vertebrates can be incorporated into all kinds of fish (except dimly, eel Jeung, "sea leech," or hagfish), amphibians, reptiles, birds, and mammals. Except for the types of fish, vertebrates known to have two pairs of legs.
Vertebrates have a lot of muscle systems consist of a mass, as well as central nervous system are usually located in the spine. The respiratory system using gills or lungs.
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