A whale's pelvis is an example of a ____ structure. a butterfly's wings and a bat's wings both do the same thing, using different ways. This makes them ____ structures. A human's arm and a bat's wing look very similar but perform different functions. This makes them ____ structures. A human's tailbone serves basically no purpose, but it did to their ancestors. This makes it a ____ structure. Penguins, sharks, and dolphins all have fins, but they are structured differently. This makes them ____ structures. Goosebumps in humans no longer serve their original purpose. This makes them ____ structures. The brains of many animals look alike. This makes them ____ structures.

Structures Missing Word

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