Evolutionary branch of vertebrates
List out the six criteria which are used to build the complete evolutionary branch of vertebrates?
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Dichotomy in the six following criteria develop the vertebrate evolutionary branch: absence of the limbs distinguishes fishes from the remaining; nonexistence of mandibles distinguishes cyclostomes from others; lack of osseous skeleton distinguishes chondrichthian (cartilaginous) fishes from the osteichthyes; nonexistence of impermeable skin distinguishes amphibians from the terrestrial vertebrates; dearth of warm blood (homeothermic body) distinguishes reptiles from the mammals and birds; lack of hair and mammary glands makes birds different from the mammals.
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