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What is the part of a long bone that is made up of compact bone and encloses the marrow cavity?

Diaphysis

The correct answer is A. Diaphysis. The diaphysis is the shaft of a long bone that is composed of compact bone. It encloses the marrow cavity where bone marrow is stored. The other options are not related to the structure of a long bone. B. Epididymis is a part of the male reproductive system, C. Acrosome is a structure found in sperm cells, and D. Diploid refers to cells having two sets of chromosomes.

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Epididymis

Acrosome

Diploid

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