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: an animal usually requires a warm body temperature for survival, Fact2: Squirrels hide and sleep in a secret warm place all winter., Question: What requires hiding and sleeping for survival? (A) bacteria (B) rice (C) amphibians (D) organisms (E) Frogs (F) trees (G) humans (H) animals
H

Fact1: Organisms use lipids to store energy., Fact2: Triglycerides are a storage form of energy., Question: In what form do organisms use lipids? (A) Triglycerides (B) glucose (C) layers of fat (D) adding heat (E) reducing acid rain (F) hydrocarbons (G) recycling (H) By wind and rain
A

Fact1: Chordates have a complete digestive system and a closed circulatory system., Fact2: Because reptiles are vertebrates, they are chordates., Question: vertebrates have a complete digestive system and a closed what? (A) digestive tract (B) lung system (C) the body's largest organ (D) circulatory system (E) Veins and arteries. (F) brain stem (G) all liquids (H) major threat to health

D