You are presented with the question "what keeps eggs warm?" and the following answer choices: 
- ice
 - hair
 - wool
 - bears
 - fur
 - sun
 - moss
 - sand

Now knowing that an egg requires warmth to survive and first the frog lays the eggs, then the warmth from the sun makes the eggs hatch into baby tadpoles, choose the best answer.


 

      sun   