Fossil fuels were living plants at one time, and all living plant and animal species depend for their existence on sunlight, or food sources that are themselves dependent on sunlight.
(Fossil fuels; were living; plants; T:at one time) (all living plant and animal species; depend; for their existence on sunlight, or food sources) (food sources; are; themselves dependent on sunlight)
Fossil fuels all living plant and animal species food sources
were living depend are
plants T:at one time
for their existence on sunlight, or food sources
themselves dependent on sunlight