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: A scanning electron microscope is best suited for observing  
 (A) diffraction of light. (B) tectonic features on planets. (C) the surfaces of small objects. (D) topographical features on the ocean floor.

SOLUTION: C

PROBLEM: In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b alleles while the other only has B alleles. Which statement is true about the brothers?  
 (A) They have the same genotype and phenotype. (B) They have different phenotypes and genotypes. (C) They have the same phenotype but different genotypes. (D) They have the same genotype but different phenotypes.

SOLUTION: C

PROBLEM: A computer model of an insect population takes into account the following parameters: * available food resources * annual temperature variation * timing of insect reproductive cycles Which additional parameter would most significantly improve the model's accuracy when predicting the insect population size?  
 (A) decomposers recycling dead insects (B) annual variation in oxygen availability (C) activities of predators preying on insects (D) variation in barometric pressure

SOLUTION:
C