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Transition of the vertebrates

Name the chordate group which considered as an evidence of the transition of the vertebrates from the aquatic to dry land atmosphere?

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The amphibians are completely aquatic in the larval phase and partially terrestrial animals as adults and for such facts they are considered intermediate beings in an evolutionary passage of vertebrates from the aquatic to the dry land habitation. Amphibians are as well the first tetrapod animals, that is, the first with two pair of limbs, a usual feature of terrestrial vertebrates. The term “amphibian” comes from the double life (that is, aquatic as larvae and partly terrestrial as adults) of such animals.

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