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They aren't, or at least not like you seem to think.

The bones in arms and legs (along with most large-ish bones, ie pelvis) contain marrow. Red bone marrow is found at the ends of the bone and is involved in a number of blood regulating functions, and yellow 'fatty' marrow is in the middle of the bones.

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Q: Why do our bones in arms and legs are tube like structure?
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