(a) It is section of a bone.
(b) W-Periosteum; X-Haversian canel; Y-Canaliculus (plural canaliculi); Z-Endosteum.
(c) The chemical composition of material of bone includes (i) Ossein (30-40%), (ii) Mineral matter (60-70%) of calcium and magnesium carbonate and phosphate.
(d) Haversian canal tends to carry nutrients to the interior of the bone.
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