TASK DEFINITION: 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.
PROBLEM: What is a main feature of plains?
(A) a flat, level surface (B) a high, steep peak (C) a low, shallow basin (D) a gentle, gradual slope

SOLUTION: A

PROBLEM: Human DNA includes a class of genes called "tumor suppressors." What do these genes do in bone cells?
(A) They restrict cell cycle progression in bone cells. (B) They promote the rapid development of bone cells. (C) They limit the number of bones in the human body. (D) They enable phosphorus and calcium to enter bone cells.

SOLUTION: A

PROBLEM: When scientists publish papers describing the results and conclusions of their experiments, members of the scientific community should
(A) collect their own data and rewrite the paper. (B) evaluate the evidence in the paper. (C) accept the paper as fact. (D) ask the writer to write an alternate paper.

SOLUTION:
B