(B) The intercellular substance of bone is hard and dense.About $35\%$ to $38\%$ of the bone matrix is organic,primarily consisting of the bone protei

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(B) The intercellular substance of bone is hard and dense.About $35\%$ to $38\%$ of the bone matrix is organic,primarily consisting of the bone protein known as ossein.About $60\%$ to $65\%$ of the matrix is inorganic,referred to as hydroxyapatite,which mainly contains calcium and phosphorus.