Which organisms can be found at the first, or lowest, trophic level? A. herbivores
B. carnivores
C. heterotrophs
D. autotrophs..

it marks things for degradation via the proteasome. it alters there celluar location.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.