Fact 1: Absorbing energy causes objects to heat.

Fact 2: Energy enters an ecosystem as sunlight.

Given the two facts above, answer the question "What causes an object to heat?" with the following options: 
- absorption
 - photosynthesis
 - electricity
 - rays or beams
 - colors of the spectrum
 - absorbing sunlight
 - absorbing ions
 - It gets heated up


 

      absorbing sunlight   