What are the stem cells?

have the potential to develop different types of cells during early life and the growth

are divided into four groups:

1.totipotent "can become any cell type"2.ploripotent "can become any type except embryotic membrane"3.multipotent "can become a number of different cell types"4.unipotent "can only became one cell type" ability to devidethe nullipotent does not have the  ability to devide"