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 difference between water and ice results in ice floating on cold water?  
 (A) heat (B) shape (C) density (D) volume

SOLUTION: C

PROBLEM: A population of ground squirrels has established a community in the grasslands of the Great Plains. Temperatures often reach -15°C for most of the winter. What is the most likely behavior the ground squirrels use to survive these winter temperatures?  
 (A) burrowing below the frost point of the soil surface (B) burrowing in tree trunks above the soil surface (C) consuming roots found under the soil surface (D) consuming organisms found in the soil surface

SOLUTION: A

PROBLEM: How are a tree and grass alike?  
 (A) Both make wood. (B) Both have roots. (C) Both need moonlight. (D) Both have short lives.

SOLUTION:
B