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").
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Question: Fact1: lakes are formed by precipitation and runoff, Fact2: Runoff from precipitation is a natural part of the water cycle., Question: What are some of the steps that forms a lake? (A) decomposition and respiration (B) storing water (C) photosynthesis and solar energy (D) near the shoreline (E) precipitation and run-off (F) perspiration and excretion (G) The area was once underwater (H) At the peak of a mountain

Answer: E

Question: Fact1: rain causes erosion, Fact2: Erosion of dunes leads to erosion of the beach and of the Island., Question: What can destroy dunes? (A) wind (B) fire (C) turtles (D) storms (E) clams (F) heat (G) rain (H) grain

Answer: G

Question: Fact1: moss causes chemical weathering, Fact2: Chemical weathering is strongest in tropical environments., Question: Where is moss the strongest? (A) near the shoreline (B) looseness of dirt or compost (C) The area was once underwater (D) It used to be covered by water (E) dead organisms (F) tropical environments (G) our nearest star (H) the body's largest organ

Answer:
F