A. 11.) Which is not a characteristic of stem cells?
Can develop into all cell types after they become specialized
b. Divide and renew for long periods of time
c. Remain undifferentiated in form for long periods of time
d. Can develop into specialized cell types

i think it's c

i really wish i could answer this question for you

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.