This is first the assumption that common genes came from a common ancestor but the scientist are finding many surprises where creatures share common genes that was not the result of common ancestor. One of those surprises were bats and dolphins shared over 200 genes. (The exact opposite is also true. Features that suppose to be the result of common ancestor are developed by different genes.)
That's because ultimately we all share a common ancestor.
The theory common genes has to be the result of common ancestor has been falsified by the evidence.
No. The fossil record alone is sufficient evidence.
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