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An Intiative by Sri Chaitanya
a
The skeletal system of vertebrates, some fish and sharks is made up of bone.
b
Bone is made up of calcium phosphate and calcium carbonate.
c
The bone cells are called Osteocytes and they secrete bone salts.
d
The hallow portion of bone is called bone marrow and is the site for production of blood cells.
answer is B.
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