$$ extbf{Solution:}$$ $$ullet$$ Stem cells are the special undifferentiated body cells which can form any type of body cell. These cells can give rise to a whole organ. $$ullet$$ Stem cells can be obtained from our own body, from amniotic fluid of a fetus, from pluripotent cells and from other person's stem cells $$ullet$$ Stem cells are present in the bone marrow, brain, blood vessels, skin, teeth, and some other tissues. $$ullet$$ The amniotic fluid of fetus also has some mesenchymal stem cells. $$ullet$$ The induced pluripotent cells are similar in function to that of embryonic stem cells. Thus, these cells can be used to form adult stem cells of an individual. $$ullet$$ Some type of adult stem cells can be transformed or differentiate to form unrelated cell type.