Nico is reading an article about two fossils that appear to have a common ancestor. Fossil X has a much more complex bone structure than fossil Y.What does this most likely suggest about the fossils?

If the fossils share a common ancestor, the more complex bone structure most likely developed later along one evolutionary branch. So fossil X most likely evolved later in Earth's history than fossil Y. Complexity alone does not prove a fossil’s exact age, but it supports this comparison in the question.

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