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alexira [117]
4 years ago
6

How are fossils helpful in identifying ancestral and derived traits of organisms?

Biology
1 answer:
Brilliant_brown [7]4 years ago
5 0
Fossils can give us direct evidence of the character states of extinct lineages. For example, all modern birds lack teeth. Is the lack of teeth an ancestral or a derived condition? If we examine extinct species of theropods we see that they had teeth. Therefore we know that the lack of teeth is a derived condition in modern birds.
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