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 traits would a species of nocturnal predators most likely develop over time to survive in the wild?  
 (A) a small size (B) flat, grinding teeth (C) sharp vision and hearing (D) resistance to weather changes

Answer: C


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

Answer: D


Question: In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?  
 (A) Consumers at the lower level require more energy than the top-level consumers. (B) Consumers at the top level require more energy than the lower-level consumers. (C) The consumers are feeding on larger organisms that have less energy. (D) The consumers are feeding on smaller organisms that have less energy.

Answer:
B