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.

[Q]: 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]: A


[Q]: Which of the following best represents one particular stage in a life cycle?  
 (A) a fish swimming (B) a seed sprouting (C) a leaf growing (D) a dog eating
[A]: B


[Q]: The Andes Mountains in South America formed when an oceanic plate shifted beneath a continental plate. Which other landforms are usually associated with this type of plate boundary?  
 (A) barrier islands (B) ocean trenches (C) mid-ocean ridges (D) volcanic island arcs
[A]:
B