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").

[EX Q]: Fact1: Zooplankton are tiny animals that feed on phytoplankton., Fact2: Many zooplankton are crustaceans., Question: What can feed on phytoplankton? (A) producers (B) phytoplankton (C) passenger pigeons (D) bacteria (E) tiny crustaceans (F) the Sun (G) honeybees (H) parasites
[EX A]: E

[EX Q]: Fact1: Biomass is the total mass of organisms at a trophic level., Fact2: Each stage is a trophic level., Question: The total mass of organisms in an environmental stage is called what? (A) food pyramid (B) extinction (C) ecological pyramid (D) food chain (E) vegetation (F) food (G) ligt (H) biomass
[EX A]: H

[EX Q]: Fact1: Climate is the average weather in an area over a long period of time., Fact2: Weather refers to the circulation of the Earth's atmosphere., Question: climate is the average what over a long period of time? (A) Earth's atmosphere circulation (B) By wind and rain (C) heat and pressure (D) bacteria (E) Temperature changing (F) Earth's density (G) characteristics (H) gravity
[EX A]:
A