The primary source of fuel for the body, especially for neurologic functioning and physical exercise is

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.