What do prokaryotes and eukaryotes have in common?
a. they both have a nuclear membrane.
b. they both have a golgi apparatus
c. they both have cell membranes.
d. they both have chloroplasts.

They both have cell membranes.

Explanation:

The prokaryotes and eukaryotes have cell membranes that enclose the cell organelles. The prokaryotes lack nuclear membrane, membrane bound organelles like the chloroplasts and also golgi apparatus.

i believe the answer is a or 1

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.