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.
--------
Question: The change in fur color of the Arctic hare from brown in the summer to white in the winter is an example of  
 (A) mimicry. (B) heredity. (C) diversity. (D) camouflage.

Answer: D


Question: During which season of the year would a rabbit's fur be thickest?  
 (A) fall (B) spring (C) summer (D) winter

Answer: D


Question: What should a scientist do to help make sure the results of an experiment are unbiased?  
 (A) Keep the results a secret. (B) Do the math without a calculator. (C) Change all of the variables in the experiment. (D) Ask other scientists to attempt to reproduce the results.

Answer:
D