True during development the skeleton of a fetus is made of cartilage which is converted to bone before birth

Early in gestation, a fetus has a cartilaginous skeleton that becomes bone in ... At birth, a newborn baby has over 300 bones, while on average an adult human has 206 bones ... It is composed of fibers and granular cells in a matrix. ... The hypertrophic chondrocytes (before apoptosis) secrete vascular endothelial cell growth ...

Explanation

n:When does the fetal cartilage turn to bone?

Key milestones in fetal bone development

Weeks pregnantMilestone

7 weeksBone outlines for entire skeleton established; cartilage is forming

8 weeksSomites disappear; joints start forming

10 weeksBone tissue forms and starts hardening (ossification)

16 weeksYour baby can move his limbs

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

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3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.