In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

[Q]: Fact1: Many consumers feed at more than one trophic level., Fact2: Consumers are heterotrophs that feed on tissues of other organisms., Question: What may eat other organisms at more than one trophic level? (A) barnacles (B) chickens (C) fur seals (D) humans (E) heterotrophs (F) mammals (G) animals (H) rabbit
[A]: E

[Q]: Fact1: Biomass is the total mass of organisms at a trophic level., Fact2: Producers make up the first trophic level, primary consumers the second, and so on., Question: What is the total mass of primary consumers (A) Plants (B) animals (C) food (D) Mountains (E) Biomass (F) decreases (G) all matter (H) Weight
[A]: E

[Q]: Fact1: if a thermal conductor is exposed to a source of heat then that conductor may become hot, Fact2: Copper is a great thermal conductor., Question: What can easily become hot if exposed to heat? (A) an object (B) engines (C) vehicles (D) animals (E) the skin (F) clams (G) copper (H) Mammal
[A]:
G