Amphibians: Class of terrestrial vertebrates which lay their eggs (and also mate) in water but live on land as adults following a juvenile stage where they live in water and breathe through gills. Amphibians were the first group of land vertebrates; today they are mostly restricted to moist habitats.

 

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Amphibians: Class of terrestrial vertebrates which lay their eggs (and also mate) in water but live on land as adults following a juvenile stage where they live in water and breathe through gills. Amphi . . . View Full Definition

Lymph Hearts: Contractile enlargements of vessels that pump lymph back into the veins; found in fish, amphibians, and reptiles.

Crossopterygians: A type of lobe-finned fish with lungs that were ancestral to amphibians.

Devonian: Period of geologic time from 410 - 360 million years before the present. Life on land diversified, with the amphibians appearing late in this period. Plants underwent major changes, includin . . . View Full Definition