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Our hands are there for movement and locomotion. In our daily life they are used in various ways, which necessitate that they can be twisted, rotated in different angle and directions. If our hands are straight without any joints, such kind of movement will not be possible. Hence we have got a complex hinge joint in our elbows.
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OK BT I want more understanding answer
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No actually I showd this answer to my teacher he said its OK BT to find more appropriate answer
Good answer :)
Because if our hand is straight we can't able to fold our hand so that we can't eat, write and like.for this reason we have hand which is not straight.
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