Directing stem cells to form differentiated cells that can replace or repair damaged tissue is called .

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.

Ithink the answer is nuclear membrane

Hmmm i'm not sure about this one