You are presented with the question "What is an example of a phase change?" and the following answer choices: 
- flow of electrons
 - Deoxyribonucleicacid
 - chemical reaction
 - dormant state
 - Global warming
 - It remains dormant
 - bullfrogs
 - swamp vegetation

Now knowing that temperature changing can cause phase changes and global warming is the change of the Earth's temperature, choose the best answer.


 

     Global warming    