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: Which is a response of the autonomic nervous system that helps maintain equilibrium in the body?  
 (A) shivering in cold temperatures (B) eating due to appetite (C) slapping at biting insects (D) pulling away from hot objects

SOLUTION: A

PROBLEM: A light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.

SOLUTION: B

PROBLEM: An ocean, a forest, and a grassy meadow are each examples of a complete ecosystem. Complete ecosystems contain only  
 (A) animals. (B) rocks and water. (C) living and nonliving things. (D) populations of plants and animals.

SOLUTION:
C