You are given a science question (hard-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: Which of the following animals is an invertebrate?  
 (A) Squirrel (B) Sea gull (C) Cricket (D) Lizard

Answer: C


Question: How are green plants an important part of the carbon dioxide-oxygen cycle?  
 (A) They add oxygen to the soil. (B) They release oxygen into the air. (C) They fix carbon dioxide in the soil. (D) They store carbon dioxide in roots.

Answer: B


Question: A man ran on a treadmill for 1,800 seconds. At the end of his run, the treadmill indicated his energy output as 240,000 J. What average power did he generate?  
 (A) 666 W (B) 133 W (C) 66 W (D) 7 W

Answer:
B