Fact 1: Sound can be used for communication by animals.

Fact 2: Sound occurs when a body, such as a vocal chord, vibrates, or moves back and forth.

Given the two facts above, answer the question "What use may some animals have for their vocal chords?" with the following options: 
- support
 - chiming
 - exoskeleton
 - courtship
 - circulatory systems
 - reading music
 - writing
 - communication


 

        communication 