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Amphibians are vertebrates, oviparous and cold-blooded.
Amphibians have thin, bare skin, with no hair.

They are born in water, with gills.
Then they move to land when they grow lungs and legs.

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Amphibians
Source | Happy Learning

All about amphibians
TadpolesFrogs Salamanders
They only vertebrates to undergo metamorphosis.
Like tadpoles turning into frogs.
Source | Free School

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