Acanthostega was an intermediate form between lobe-finned fishes and early terrestrial tetrapods, providing evidence for the theory of amphibians evolving from ancient fish.
Acanthostega was an aquatic tetrapod that is considered an intermediate form between lobe-finned fishes and early terrestrial tetrapods. It had gills like fishes and limbs similar to present-day tetrapods, including amphibians. This supports the theory that amphibians evolved from ancient fish.
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