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: Which substance do all living things require to survive?  
 (A) blood (B) water (C) carbon dioxide (D) organic soil

A: B
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Q: A condition in bees called "colony collapse disorder" occurs when worker bees leave the hive to collect nectar and never return. How would a decline in the bee population most likely affect a farm ecosystem?  
 (A) There would be a decrease in soil thickness. (B) There would be a decline in fruit production. (C) There would be an increase in plant diseases. (D) There would be an increase in insect pest populations.

A: B
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Q: A student is conducting an investigation using chemicals. Other than goggles and gloves, what else should the student use in order to conduct this investigation safely?  
 (A) lab coat (B) Petri dish (C) Bunsen burner (D) loose-fitting clothing

A:
A
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