You are presented with the question "An egg requires _ to survive" and the following answer choices: 
- incubation
 - condensation
 - Energy.
 - heat energy
 - nutrients
 - energy
 - moisture
 - oxygen

Now knowing that an egg requires warmth to survive and sunlight and warmth are vital to the incubation of eggs and a successful hatch of fry, choose the best answer.


 

 incubation        