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: You wish to closely observe a small insect. Which tool is the best to use?  
 (A) a balance (B) a test tube (C) a telescope (D) a magnifying glass

Answer: D


Question: Which of these is a structure that is present in all organisms?  
 (A) a tissue (B) a cell (C) a stomach (D) a brain

Answer: B


Question: Which would be the most likely effect of a large decrease in the number of woodpeckers in a forest?  
 (A) Temperatures would increase. (B) Precipitation would increase. (C) The number of trees in the forest would increase. (D) The insect population in the forest would increase.

Answer:
D