Lammy writes:
Off the top of my head, I can't think of any animal that uses the wheel and axle for locomotive purposes. How come evolution never came up with the wheel and axle?
Wheels aren't very effective underwater where animals first evolved. It was much easier to evolve fins into limbs than into wheels, not to mention that limbs are much more effective on land than wheels. Try chasing down a deer in a forest with a wheeled vehicle and you will soon learn how much better limbs are than wheels.
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