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

Fact 2: For mating, communication is between individuals of the same organism.

Given the two facts above, answer the question "What do animals use to find a mate?" with the following options: 
- desire
 - sound
 - saliva
 - humans
 - Light
 - DNA
 - zoos
 - gametes


 

  sound       