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Convergent evolution, where similar structures evolve independantly in distanlty related organisms, or even variability within a species (group of organisms that are genetically similar enough to eachother to have fertile offspring) can make grouping based on physical characteristics problematic.

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9y ago
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12y ago

Prokaryotes and other types of asexual species. Naturally, it can not be applied to fossils of any type.

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12y ago

Asexual Organisms, because this concept relies on reproduction and hybrid sterility, which cannot be tested on organisms that do not sexually reproduce.

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Q: What makes physical characteristics an inadequate basis for grouping members of a species?
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