Why do some researchers prefer to use embryonic stem cell in medical research? A. There is no controversy surrounding the use of embryonic stem calls
B. The use of embryonic stem cell is much less expensive than the use of adult stem cells
C. No living tissue is damaged when scientists use embryonic stem cells
D. Embryonic stem cells are able to differentiate into a wider range of call than adult stem cells

Cell therapies would use stem cells, or cells grown from stem cells, to replace or rejuvenate damaged tissue. Scientists also want to use stem cells to understand disease and find drugs that might treat it. Embryonic stem cells could be used to make more specialized tissues that have been lost to disease and injury

ability to bond woth oxygen

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.