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.

Q: If an environment becomes warmer and drier, the change that would most likely help a species adapt would be an increase in its  
 (A) amount of body fat. (B) amount of body hair. (C) ability to climb trees. (D) ability to store water.

A: D
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Q: Which land feature is formed from erosion by waves?   
 (A) a sandbar (B) a sea cliff (C) a barrier reef (D) a barrier island

A: B
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Q: In which of the following organs is an acid produced?  
 (A) esophagus (B) large intestine (C) small intestine (D) stomach

A:
D
****