Double D batteries
Gas :)
the energy between the bonds of the fuel in the engine.
Carbohydrates, as a class, provide the most readily available energy source for cells. The complex carbohydrates will split to simple sugars for immediate fuel.
Fuel. :)
OIL!
glucose
natural gas
in its early stages this fossil fuel is a spongy brown material
Wind
Food provides you with the fuel, you still need oxygen to turn it into energy.
Corn usually provides the most energy for horses. also Rolled oats.
this fossil fuel provides about 40% of the worlds energy