Which appear first in the fossil record: Reptiles, amphibians, birds or mammals?
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Answer: amphibian
Explanation:
By about 330 million years ago, in the Mississippian, several groups of land-dwelling amphibians had appeared. The oldest known amniotes -- close to the ancestry of all reptiles, birds, and mammals -- appeared in the early Pennsylvanian, about 310 million years ago.
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» Amphibians appear first in the fossil record .
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