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: All of the following can become fossils except  
 (A) bones. (B) shells. (C) teeth. (D) rocks.

SOLUTION: D

PROBLEM: A scientist uses angstrom units to measure the distance between two points. The scientist is most likely measuring the distance between two  
 (A) atoms. (B) cities. (C) continents. (D) stars.

SOLUTION: A

PROBLEM: Which characteristic is found ONLY in mammals?  
 (A) eyes that detect color (B) glands that make milk (C) skin that absorbs oxygen (D) bodies that are protected by scales

SOLUTION:
B