Question

why do arms and legs have large tube like bones
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Answer 1

Answer:

The legs and arms of human beings have hollow tube like bones, because these bones need to be highly strong and moveable, due to continuous uses of the limbs in all activities.

Moreover, these bones need to be hollow, so that the blood vessels and the nerves can pass freely through these tube-like bones.

These bones are made of calcium salts and collagen, to ensure the required lightness and perfect strength of these structures, so that the arms and legs can be moved easily.