The first terrestrial vertebrates,which never became completely free from water habitat,were _____.

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The first terrestrial vertebrates that evolved from fish were amphibians, which had adaptations that allowed them to survive both in water and on land. However, amphibians never completely left the water as most still rely on it for reproduction and hydration. Reptiles, birds, and mammals evolved later and are considered fully terrestrial animals that do not need to rely on water for survival. Insects are not vertebrates and were not the first terrestrial animals.

The First Terrestrial Vertebrates,which Never Became Completely Free from Water