instruction:
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 body system's primary function is the continuation of the species?  
 (A) digestive (B) nervous (C) excretory (D) reproductive
answer:
D


question:
Some scientists predict that as greenhouse gases change the climate of Earth, the number and strength of hurricanes will increase. In order for this to occur, the climate change would have to affect Earth by changing the  
 (A) depths of the oceans. (B) speed of currents in the oceans. (C) chemical compositions of the oceans. (D) amount of dissolved oxygen in the oceans.
answer:
B


question:
Which is an example of a learned behavior?  
 (A) A tiger hunts a deer. (B) A mouse runs from a coyote. (C) A salmon migrates up a river. (D) A woodpecker taps a tree for insects.
answer:

A