Which organism below in the food web is found in the first trophic level of the ecosystem? -Cougar
-Coyote
-Acorns
-Mouse

mouse is the best answer

Acorns

Explanation:

The first trophic level consists of producers or plants. The only plant on the list is acorns.

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.