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Scientists notice structural similarities between fossils of a land animal and an aquatic organism. They know the similarities are not a result of the two organisms having to adapt to similar environments. What can they attribute the structural similarities to?

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JcAlmighty
The answer is common ancestor.

Since these two organisms are adapted to different environments and still have structural similarities, that means that they must have a common ancestor. Common ancestor is an ancestral organism that two or more descendant lineages have in common.

the correct answer is B) common ancestry

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