Autotroph is to producer as heterotroph is

consumer

Explanation:

Autotroph is to producer as Heterotroph is to consumer. Autotrophs make their own food, which makes them producers. While Heterotrophs cannot make their own food, and must obtain it from another source, making them consumers.

Consumer that eats a producer or another consumer

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.