What is one disadvantage of this approach? It is very difficult to determine whe

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What is one disadvantage of this approach?

It is very difficult to determine whether morphological differences among fossils represented normal variation within populations or meaningful differences among species. It is impossible to determine whether the differences were left on fossils by some catastrophe or by time or they are meaningful differences among species. It is quite complicated to evaluate the causes that lead to the speciation of ancient humans. It is difficult to determine the age of fossils and thus to define the order of speciation of human's ancestors.

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"It is very difficult to determine whether morphological differences among fossils represented normal variation within populations or meaningful differences among species."

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