Analogous structures are features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature (compare to homologous structures) and which evolved in response to a similar environmental challenge.Example: Insects and birds both have wings to fly, although their wing structure is very different this is an example of an analogoues structure. The fat-insulated, streamlines shapes of seals (mammals) and of penguins (birds) is another example.

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