Fossil fuels are primarily biological in origin. Certainly we extract the energy in a much different way, but that energy capacity is there biologically (slow b

Fossil fuels are primarily biological in origin. Certainly we extract the energy in a much different way, but that energy capacity is there biologically (slow burn, turns out high speeds aren't actually that useful in nature). As for wheels, hip joints are a more efficient design of a rotatory system (multiple degrees of freedom). Wheels are much too simple a design to see much use in nature.