What would happen to an organism if its heart cells stopped working properly?

a.
the organism would develop new cells to take their place.
b.
the circulatory system would fail, and the entire organism would suffer.
c.
the organism would slow down its breathing, so that the heart could recover.
d.
tissue from another part of the body would take over to keep the heart beating.

answer: populations of walruses and polar bears will decline

explanation:

you put it

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.