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Section 3

Amphibians

Book Version 32
By Boundless
Boundless Biology
Biology
by Boundless
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Characteristics and Evolution of Amphibians

Amphibians evolved from fish 400 million years ago and are characterized by four limbs, moist skin, and sensitive inner ear structures.

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Modern Amphibians

Amphibians can be divided into three groups: Urodela (salamanders), Anura (frogs), and Apoda (caecilians).

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