pick from the following.
 a). Generating heat
 b). volume
 c). colors of the spectrum
 d). organisms and their habitat
 e). density
 f). Transfers energy
 g). gravity
 h). it helps plants in growing
Q: 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, what does energy enter in the form of sunlight or chemical compounds?
A:
d).