Complete evolutionary branch of the vertebrates
Explain the six criteria employed to build a complete evolutionary branch of the vertebrates?
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Dichotomy in each of six following criteria forms the vertebrate evolutionary branch: deficiency of mandibles separates cyclostomes from others; deficiency of limbs detaches fishes from the remaining; detaches of osseous skeleton detaches chondrichthian (or cartilaginous) fishes from osteichthyes; in the presence of impermeable skin detaches amphibians from the terrestrial vertebrates; in the presence of warm blood (or homeothermic body) separates reptiles from mammals and birds; absence of mammary glands and hair detaches birds from mammals.
Evolutionarily protochordates might be intermediate animals among vertebrates and invertebrates.
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