You are presented with the question "What causes an object to heat?" and the following answer choices: 
- absorption
 - photosynthesis
 - electricity
 - rays or beams
 - colors of the spectrum
 - absorbing sunlight
 - absorbing ions
 - It gets heated up

Now knowing that absorbing energy causes objects to heat and energy enters an ecosystem as sunlight, choose the best answer.


 

      absorbing sunlight   