Atoms of different elements always combine in the same way.
John Dalton noted that if the components are added to one exacerbated, the share of their masses will dependably be the same. Dalton's been an English scholar. The component mass of that mix is measured by the confirmation of the presence of molecules assembled by John Dalton.
Ethanol produced from bioenergy starts with starch produced by corn and sugar cane :)
1st stage, also known as the Krebs cycle, also know as the citric acid cycle