Please answer the following question by reasoning step-by-step.
What do organisms in the lowest trophic level use as food?\nOptions:\n- (A) Organic compounds\n- (B) food and shelter\n- (C) heat energy\n- (D) Chemical energy\n- (E) Chlorophyll\n- (F) members of their own species\n- (G) scarce resources\n- (H) inorganic molecules

(H)
Producers make food from inorganic molecules.

Primary producers make up the lowest trophic level.

The lowest trophic level makes food from inorganic molecules.

.

So, the final answer is (H)