So why do so many life-forms breathe oxygen? There are probably thousands of kinds of metabolisms, or chemical processes that ...

oxidation is the loss of electrons reduction is the gain of electrons Balance the half equation for the formation of aluminium during electrolysis: Al 3+ + e-→ Al. The balanced half equation is: ...

this is described as a reduction reaction as aluminium ions are gaining electrons and the gain of electrons is reduction.

while the other gains electrons (reduction). Metalloenzymes play essential roles in biology but controlling outer-sphere interactions to influence their functions remains a significant challenge.