A Paleontologist Finds a Fragment of a Fossilized Vertebrate That

question 126

Multiple Choice

A paleontologist finds a fragment of a fossilized vertebrate that indicates that the adult animal had a four-chambered heart arranged in a single circuit.The animal could have been a(n)

• A) fish.
• B) amphibian.
• C) crocodile.
• D) bird.
• E) mammal.

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