Even before organs begin to form, rudimentary forms of bone begin to form in a fetus due to _____________.
A) the breakdown of hyaline cartilage.
B) the formation of secondary ossification sites.
C) the activity of chondroblasts.
D) the formation of an osteoclast.
E) the activity of growth hormone.
Ans: C) the activity of chondroblasts.
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