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: In an ecosystem, not all of the energy that is available is used by the organisms. Some energy becomes unavailable before it can be transferred to organisms in the next trophic level. How does the energy most likely become unavailable?
(A) The energy is stored as food. (B) The energy is dissipated as heat. (C) The energy is trapped in dead organisms. (D) The energy is moved to another ecosystem.

SOLUTION: B

PROBLEM: An object such as a hammer weighs less on the Moon than on Earth. This is because the Moon has a
(A) thinner atmosphere than Earth. (B) smaller diameter than Earth. (C) stronger magnetic field than Earth. (D) lower mass than Earth.

SOLUTION: D

PROBLEM: Fungi recycle leaves in forests. Fungi release chemicals onto the leaves to break them down into smaller particles. The fungi use the small particles for growth. Which process allows fungi to obtain the nutrients they need from dead leaves?
(A) circulation (B) digestion (C) reproduction (D) respiration

SOLUTION:
B