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

Answer: B


Question: Divergent tectonic plate boundaries most commonly form  
 (A) ocean ridges. (B) ocean trenches. (C) non-volcanic islands. (D) continental mountains.

Answer: A


Question: Which process occurs during meiosis that contributes to a germ cell having unique genetic material?  
 (A) transcription (B) replication (C) crossing over (D) spindle formation

Answer:
C