When unrelated organisms living under similar environmental demands evolve superficially similar structures, it is called:

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Convergent evolution refers to the process by which unrelated organisms living under similar environmental pressures evolve superficially similar structures. This is different from coevolution, which occurs when two or more species influence each other's evolution over time, and comparative anatomy, which is the study of similarities and differences in the anatomy of different species. There is no such thing as superficial selection.

When Unrelated Organisms Living Under Similar Environmental Demands Evolve Superficially