Q.

The central hollow portion of human bones contains __________.

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a

bone marrow to provide oxygen for the body

b

nerves to give signals to the muscles attached to the ones

c

bone marrow to produce blood cells

d

nothing but empty space filled with air

answer is C.

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Detailed Solution

The central hollow portion of human bones contains bone marrow to produce blood cells.

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The central hollow portion of human bones contains __________.