Fact 1: Energy enters ecosystems in the form of sunlight or chemical compounds.

Fact 2: Solar energy is clean energy .

Given the two facts above, answer the question "What enters ecosystems?" with the following options: 
- an object
 - Waste
 - bacteria
 - Solar light
 - heat produced
 - Plastics
 - Metals
 - rays or beams


 

    Solar light     