Evolution of Amphibians. How do we define the Amphibia?. Amphibians. They have a 2-phase life history. There is usually a free-living aquatic developmental stage. There is usually a terrestrial juvenile/adult stage.
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How do we define the Amphibia?
Why make the transition to an aquatic ecosystem?
The old hypothesis was that they ‘wanted’ to move to new bodies of water. Does this make sense?