Acanthostega is an extinct amphibian. Fossils indicate that it had four limbs, lungs, gills, and a tail used to propel itself through water. Why are Acanthostega fossils considered transitional fossils?

A. They display evidence of a form between an ancient fish and a modern bird.

B. They display evidence of a tetrapod with lungs.

C. They display evidence of gills and a fin-like tail.

D. They display evidence of a intermediate form between a fish and a tetrapod land animal.

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1 August, 22:13

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Jordon Farmer · Answer 1

D. because the amphibian displays lungs when it lives in the water according to the tail