This is an organism that relies on complex organic substances for nutrition.

The correct answer is - heterotroph.

Explanation:

A heterotroph is a group of organisms that depends on then the other organic carbon substances which are complex for their nutrition, mostly on animals and plants matter.

Heterotrophs in a food chain can be a primary, secondary or tertiary consumers but can not be producers as they do not produce their food.  The examples of the heterotrops are human, animals, and other primary, secondary or tertiary consumers.

Thus, the correct answer is -Heterotrophs.

is in the form atp or adenosine triphosphate

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.