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: Plants growing in a pond release a gas that fish need to survive. Which gas do the plants release that fish use?  
 (A) helium (B) hydrogen (C) nitrogen (D) oxygen

SOLUTION: D

PROBLEM: After playing outside on a cold day, Jaime went inside to wash his hands. Although the water was normal temperature, he noticed that it felt warmer than usual. What would explain this phenomenon?  
 (A) His body had more kinetic energy than the water. (B) Heat flowed from a cooler substance to a warmer substance. (C) The water from the faucet had a higher temperature than his skin. (D) The thermal energy in the room was higher than the thermal energy outside.

SOLUTION: C

PROBLEM: In living things, large and complex molecules are broken down into small and simple molecules. What is this process called?  
 (A) excretion (B) absorption (C) digestion (D) circulation

SOLUTION:
C