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: Evolution is a change in the characteristics of living things over time., Fact2: Evolution relies on random chance acts to cause mutations., Question: What causes changes in characteristics of living things over time? (A) mutations (B) science (C) parents (D) environment (E) light energy (F) news (G) alleles (H) animals

A: A
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Q: Fact1: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton

A: B
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Q: Fact1: Cells are the basic units of the structure and function of living things., Fact2: Physiology is the study of the function of living things., Question: Which of the following sciences studies cells? (A) sensory neurons (B) Astronomy (C) epidermal (D) it needs them (E) Physiology (F) retina (G) Anatomy (H) Astrology

A:
E
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