explain how animals in vertebrates are classified into further subgroups ???
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Superclass Tetrapoda and superclass Pisces
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Vertebrata are further classified into sub-groups on the basis of following features:
1) Nature of heart(two, three or four chambered).
2)Presence of exoskeleton eithier in the form of scales, feather or hair
3) Mode of respiration (By skin ,lungs or gills)
4) Presence of mammary glands.
5)Reproduction (Egg laying or give birth to young once
They are further classified into classes Pisces, Amphibia, Reptilia, Aves and Mammals. Pisces include the fishes
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