Another challenge to evolutionary explanations is when two structures appear to be homologous but evolutionists know they don't share a common ancestor. Such cases are called "convergent evolution." The eyes of squids and vertebrates are an example where the eyes would be called homologous, but there is no common ancestor to account for the similarities. The common designer argument can once again be used to more easily explain the similarities.
The opposite occurs in "divergent" structures where organisms that appear to be evolutionary cousins have drastically different mechanisms that cannot be explained by a common ancestor. Different light-focusing methods in shrimp provide an example. These systems accomplish the same goal with different and intricate design features-more evidence of their Creator.
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