You are presented with the question "Animals rely on what for survival?" and the following answer choices: 
- proteins
 - glycogen
 - rocks
 - sunlight
 - stars
 - weeds
 - cellulose
 - plants

Now knowing that an animal requires air for survival and it is breathed in by animals and restored to the air by the photosynthesis mechanism of plants, choose the best answer.


 

        plants 