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").

Fact1: chemical weathering causes iron in rock to oxidize, Fact2: Oxides Oxides Oxides are elements combined with oxygen., Question: Chemical weathering causes iron in rock to combine with what? (A) uranium (B) oxygen (C) cartilage (D) nothing (E) an object (F) vacuum (G) energy (H) heat
B

Fact1: Coral reefs provide food and shelter to many ocean organisms., Fact2: Coral reefs occur mainly as numerous patch reefs., Question: Where is the name of a habitat where a variety of ocean organisms often seek food and shelter? (A) gastropod shells (B) body water (C) seaweed (D) more abundant (E) whale (F) coastlines (G) algae (H) patch reefs
H

Fact1: an aquatic animal requires great amounts of water to survive, Fact2: Too much algae can deplete the water of oxygen, making it impossible for aquatic animals to survive., Question: an aquatic animal requires not having too much what in water? (A) warmth (B) Energy. (C) energy (D) fats (E) algae (F) matter (G) harm (H) sodium

E