Question

Petroleum is a very useful natural resource. It is used in running our vehicles, ships, aeroplanes and industries
But there is limited stock of petroleum in the world. It is necessary to check its misuse. Taking ideas from The hints given below. prepare a speech for a declamation contest on SAVE FUEL FOR FUTURE
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Answer 1

Explanation:

A joint is the part of the body where two or more bones meet to allow movement. Generally speaking, the greater the range of movement, the higher the risk of injury because the strength of the joint is reduced. The six types of freely movable joint include ball and socket, saddle, hinge, condyloid, pivot and gliding.