they dont
Biofuels
jet engines require air, compression, and combustion to make it work
source:(http://en.wikipedia.org/wiki/Biofuel)we use biofuels because they do not make as much pollution as normal fuels.
The pistons of a bus move to make the wheels move.
In order to grow the crops required to produce biofuels more forests need to be knocked down to make the necessary fields.
The same way fossil fuels power work. They are just produced in a different way.
SG Biofuels was created in 2007.
Yes, soybean oil is the main source of biodiesel.
Burning biomass to make ethanol and bio-diesel.
by mechanical force Presumably with renewable resources, such as biofuels, wood etc. Obviously it depends on the type of engine.
Biofuels are fuel made from any plant or animal based products. Two traditional biofuels are wood and corn. Biofuels are renewable sources of energy.
Biofuels are renewable because we can continue producing the living things which are the source of the fuel. For instance, sugar cane can be planted anew each year, and used to produce alcohol for burning in car engines.