You are presented with the question "What do mammals use eyes for?" and the following answer choices: 
- to sense sound
 - to touch things
 - focusing a lens
 - it needs them
 - encoded information
 - to sense light
 - to sense smell
 - food and shelter

Now knowing that eyes are used for seeing by animals by sensing light and mammals are animals with a backbone, choose the best answer.


 

      to sense light   