In the early days, people had a hard time dragging things across the ground. To help them in this task, they first devised various forms of yokes, so that the two or more persons or animals could work together to drag the same heavy load. So people find ways on how to improve this thing, and then came up with today’s wheels. Wheels are used in conjunction with an axle; either the wheel turns on the axle or the wheel is rigidly attached to the axle which then turns in bearings in the body of any vehicle.

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