I WILL GIVE BRAINYEST IF ANSWERD CORRECTLY What is the main source of energy for all organisms in an ecosystem?

bacteria and fungi
omnivores
energy from the sun
flowers and trees

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.