Our hands are thereĀ forĀ 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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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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