environmental demands, unrelated species might independently evolve superficially similar structures, a process called convergent evolution. Such outwardly similar body parts in unrelated organisms, termed analogous structures, may be very different in internal anatomy, because the parts are not derived from common ancestral structures. The wings of flies and of birds are analogous structures that have arisen by convergent evolution; the fat-insulated, streamlined shapes of seals (mammals) and of penguins…
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