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: To study the effect of heat on plant growth, Andy divided ten identical seedlings into groups. She placed one group on a windowsill in the sun and the other group in a dark closet on the cool (north) side of the house. Think about the characteristics of a properly designed scientific experiment. What is wrong with the above experiment?
(A) The temperature difference between the two groups was not great enough. (B) The amount of light was different for the two groups. (C) One group of seedlings got less water than the other. (D) Nothing is wrong with the experiment.

SOLUTION: B

PROBLEM: Some plant species are more tolerant of acidic soil than others. The tolerant species are favored in areas affected by which consequence of human activity?
(A) mixing of pollutants with rain (B) erosion of topsoil by clearcutting (C) runoff of fertilizer used in farming (D) thinning of the atmospheric ozone layer

SOLUTION: A

PROBLEM: Reptiles become more active as the day gets warmer. This is because
(A) they have scaly skin. (B) they have slimy skin. (C) their body temperature stays at a constant level. (D) their body temperature changes with the environment.

SOLUTION:
D