TASK DEFINITION: You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
PROBLEM: Compost piles have many parts, such as leaves, moisture, vegetables, and microorganisms. Which part of a compost pile breaks down materials and adds nutrients to the soil?
(A) leaves (B) moisture (C) vegetables (D) microorganisms

SOLUTION: D

PROBLEM: An enclosed 20 mL metal cylinder was filled with a gas sample at room temperature. The sample then was transferred to an empty 40 mL enclosed container, also at room temperature. After being transferred, the volume of the gas was
(A) 10 mL. (B) 20 mL. (C) 30 mL. (D) 40 mL.

SOLUTION: D

PROBLEM: Which is the greatest benefit of sexual reproduction?
(A) capable of reproducing by meiosis (B) ability to reproduce without a mate (C) ability to produce genetically different offspring (D) capable of producing offspring genetically identical to parent

SOLUTION:
C