What is the best definition of etc reaction

Electron transport chain is a series of biochemical reactions in which high energy molecules are produced via redox reactions that is oxidation and reduction reactions take place simultaneously.

It is also the primary step for the production of ATP molecules and is carried out in the mitochondria of cells. Electron transport chain is an important step of cellular respiration as it yields high energy ATP and NADPH molecules.

i believe it is 40–40–20%

explanation:

i think so it’s will be b yes i believe its