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: Carbon may be stored in sedimentary rock for millions of years., Fact2: Limestone is a type of sedimentary rock., Question: What element can be stored in limestone for millions of years? (A) oxygen (B) Energy (C) matter (D) carbon (E) sodium (F) helium (G) rock salt (H) heat

Answer: D


Question: Fact1: All cells share some of the same structures and basic functions., Fact2: Inside the cell is a structure called the nucleus., Question: All nucleus share the same basic what (A) size (B) rays or beams (C) species (D) Joules (E) location (F) allow growth (G) functions (H) spectrum

Answer: G


Question: Fact1: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Small temperature variations can have major effects on natural ecosystems., Question: What can volcanic ash in the atmosphere do to natural ecosystems? (A) Create wealth (B) negative feedback (C) rapid changes occur (D) Major effects (E) erosion (F) No effect (G) Forest fire (H) Start engines

Answer:
D