Wheels are a highly specialized and complex structure, and as such, it is highly unlikely that they would have evolved naturally in animals. Evolution of wheels would require development of a special skeletal structure and joints capable of supporting an animal's weight and allowing it to rotate muscles and tendons to drive wheel rotation, probably at a considerable cost in terms of survival and reproduction. Lastly, the wheel is a human invention, very useful in some circumstances, but the result of human ingenuity and technology rather than natural development.
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