The anatomical structure of bird wings and butterfly wings when compared to each other are found to be Analogous.
Explanation:
Analogous structures are structures that share functions and may look alike because both adapted in the same way to the same conditions in the environment. However, they may have a distant evolutionary relationship. Another example is the wings of a bat and wings of a bird. These two features are analogous because remember that a bat is a mammal while a bird is an ave. Homologous structures share close evolutionary relationship even though they may appear different.
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