Answer: Fossils of limb structures provide evidence that ancient and modern tetrapods are related because it backs up the fact that both ancient and modern tetrapods follow the one bone two bone many bone digit pattern. It suggests to how modern and ancient tetrapods have the ancestry which come from early tetrapods.
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He/she is talking about genetic disorders. Interesting topic. An oncologist is a cancer specialist so I don't know the specific cancer disorder but I'm sure there is one.
