By age 20, a person's bones stop growing because...
A. bone-forming cells are no longer present
B. less calcium is present in the body
C. hormones cause the growth centers at the ends of the bones to degenerate
D. bone cells receive less oxygen and nutrients at that time
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actually, our growth is controlled by the endocrine glands of our body. These endocrine glands are pituitary gland, thyroid gland, thymus gland and some sex glands. Pituitary gland is situated in brain and it controls the growth of the bones. We know that thymus glands shrinks completely at the age about 16.
At the age of 20 to 24 the body gets the full maturity and after that the body stops growing up, because after this age the glands which are responsible for growth become less active. But there is very slow continuous growth even afterhis contraction is because of the drying up of the cartilages in our spinal column and joints. the age of 35 to 40 years. The body starts contracting after this age.