You are presented with the question "What heats frog eggs so that they may hatch into tadpoles?" and the following answer choices: 
- sun's heat
 - heat
 - the sun
 - geothermal vents
 - Cooking
 - the mother frog
 - the father frog
 - sunlight

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.


 

   the sun      