You are presented with the question "Some animals communicate through what?" and the following answer choices: 
- chemical reaction
 - eating quietly
 - vibrating quickly
 - being silent
 - chemical changes
 - hormones
 - barks and snarls
 - chemical messengers

Now knowing that sound can be used for communication by animals and snarls and barks are the sounds they make, choose the best answer.


 

       barks and snarls  