The stem of a plant is full of undifferentiated cells. Thus the name stem cells.
Most likely because they are the cells from which all specialised cells Stem, i.e. stem cells are the precursors which form more differentiated types of cells, e.g. blood, bone are formed from, or...
differentiation
'Cause maryam luvs lil wayne
No. Stem cells occur naturally in the human body. However we are trying to clone stem cells to aid in there research.