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The class Aves, the birds, is a various group of about 8,800 species of warm-blooded (or homoiothermic) tetrapods whose forelimbs are specialised for flight (though some species are secondarily flightless). The class Chondrichthyes includes about 800 dwelling species of sharks, rays, and rat fishes, all of which have a cartilaginous skeleton, true jaws, and a variety of other distinctive characters. The placoderms have been primitive, jawless, fish like creatures, whose head was closely armored by an exterior shield of bony plates.
Frogs have numerous modifications that permit them to keep away from predators, together with pores and skin that acts as camouflage and defensive chemicals which might be toxic to predators secreted from glands in the pores and skin. Lampreys live primarily in coastal and recent waters and have a worldwide temperate region distribution. Eggs are fertilized externally, and the … Read MoreRead More »