Amphibians evolved millions of years ago. They are the only living true vertebrates that have made a transition from water to land in both their ontogeny (life development) and phylogeny (evolution). Amphibians can be found in freshwater and moist terrestrial habitats throughout the world.
Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, etc.
Evolution is change in the heritable characteristics of biological populations over successive generations.
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