When an animal or plant of many cells breaks up into two or more parts, and when these parts survive to produce a new organism, reproduction occurs
a. conjugation
b. budding
c. regeneration

When an animal or plant of many cells breaks up into two or more parts, and when these parts survive to produce a new organism, reproduction occurs by regeneration

Explanation:

Regeneration is illustrated as how some organisms renew failed or separated body parts. The capacity of renewing portions may differ between organisms. Only a distinct structure on the piece of the old one can be developed by organisms.

In the process of reclamation, the entire bodies may restore large parts of themselves when they have been made in two. Regeneration, as one phase of the global manner of growth, is a fundamental characteristic of all living systems. Without it, there could be no life, for the real preservation of an organism.

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.