Energy enters ecosystems in the form of sunlight or chemical compounds.
Compounds or molecules chemical compounds are combinations of elements.
Energy enters ecosystems in the form of sunlight or combinations of elements.
What enters ecosystems in the form of sunlight or combinations of elements?
Options:
(1) food
(2) energy
(3) heat
(4) electricity
(5) photons
(6) Energy.
(7) gas
(8) sunlight