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.

Similar types of cells form tissues. What is the next level of complexity formed from the grouping of tissues?  
 (A) organs (B) organelles (C) organisms (D) organ systems
A

Which of the following forms of energy is released or absorbed in most chemical reactions?      
 (A) light energy (B) electrical energy (C) sound energy (D) heat energy
D

Jonathon was studying bears. He found out that bears are born with some behaviors and learn others from their environment. Which behavior does a bear most likely inherit?  
 (A) how to find food in garbage cans (B) how to hibernate during the winter (C) how to seek shelter in a hollow log (D) how to live in human neighborhoods

B