Question

why we die without oxygen​

Answer 1

Answer:

with out oxygen brain cell can't metabolize glucose, and glucose can't convert into energy.

Answer 2

$\underline{\underline{\tt \: ANSWER \: }}}$

Most living organisms are aerobic; that is, they require oxygen to complete the total breakdown of glucose. As many as 36 ATP are produced through aerobic metabolism of one glucose molecule. Without oxygen, cells do not synthesize enough ATP to maintain a multicellular organism. Most people think that we need oxygen to breathe, actually, we need oxygen to recycle the spent electrons and hydrogen ions produced as by-products of aerobic respiration. With this by-products oxygen combines and forms "metabolic" water.