Fact 1: Plants release oxygen during the day but not during the night.

Fact 2: All plants are of bush type.

Given the two facts above, answer the question "what releases oxygen during the day but not during the night?" with the following options: 
- the sun
 - Trees
 - lungs
 - Oak
 - Conifers
 - bushes
 - clouds
 - flowers


 

      bushes   