You are presented with the question "what do moon phases depend on?" and the following answer choices: 
- heat
 - UV
 - RNA
 - stars
 - tides
 - asteroids
 - sun
 - mass

Now knowing that the moon revolving around the Earth causes the phases of the moon and phases of the moon, however, depend on the relative positions of the Earth, moon, and Sun, choose the best answer.


 

       sun  