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: Overuse of soil for farming causes local disruptions of several Earth subsystems. Which of these is a part of the biogeochemical cycle that experiences the most severe local disruption?
(A) release of carbon into the atmosphere (B) release of oxygen into the atmosphere (C) cycling phosphorus into the soil (D) cycling hydrogen into the soil

SOLUTION: C

PROBLEM: One advantage of a hand lens over a microscope is that the hand lens
(A) is easier to carry on field investigations. (B) is less likely to be infected by bacteria. (C) makes very tiny objects appear larger. (D) produces a more accurate image.

SOLUTION: A

PROBLEM: What is the relationship between an ecosystem and a community?
(A) A community is a very large ecosystem. (B) An ecosystem is a very large community. (C) An ecosystem includes a community and abiotic factors. (D) A community includes an ecosystem and abiotic factors.

SOLUTION:
C