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.
--------
Question: Which of the following is an example of a behavioral adaptation?  
 (A) hooves of a horse (B) migration of birds (C) a spider web (D) a bee hive

Answer: B


Question: 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

Answer: D


Question: Constellations are patterns of objects seen in the night sky from Earth. How are the objects in constellations like the Sun?  
 (A) The objects are stars. (B) The objects are planets. (C) The objects are located in this solar system. (D) The objects heat the atmosphere of Earth.

Answer:
A