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 light year is used to measure  
 (A) time. (B) distance. (C) luminosity. (D) temperature.

SOLUTION: B

PROBLEM: Cells come in two basic types, prokaryotic and eukaryotic. Which cell structure is found in both prokaryotic and eukaryotic cells?  
 (A) vacuole (B) nucleoid (C) mitochondrion (D) cytoplasm

SOLUTION: D

PROBLEM: Birds eat non-camouflaged moths at a higher rate than they eat camouflaged moths. In which situation would birds eat the moths at the slowest rate?  
 (A) dark moths in any environment (B) light moths in any environment (C) dark moths in a light environment (D) light moths in a light environment

SOLUTION:
D