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

Fact 2: An ecosystem includes the organisms and their habitat.

Given the two facts above, answer the question "what does energy enter in the form of sunlight or chemical compounds?" with the following options: 
- Generating heat
 - volume
 - colors of the spectrum
 - organisms and their habitat
 - density
 - Transfers energy
 - gravity
 - it helps plants in growing


 

    organisms and their habitat     