The answer is B) These fuels are available in a limited supply- - when the fuel is used it is no longer available.
The key processes in the fast carbon cycle include: Photosynthesis: the absorption of CO2 from the atmosphere (terrestrial plants) and from oceans (marine plants) to produce organic carbon structures. Respiration: the release of CO2 into the atmosphere, soil and oceans by animals as they exhale.
The genetic combination of its parents
Discontinuous variable ;)
