Question

do all organisms need oxygen to survive? ?? explain...pls don't answer if not sure....

Answer 1

the answer is


no
for example- methanogen; they die in the absence of oxygen and prepare their food by using gas methane

some of the archaebacterias as they are being prepared to test for their survival  on mars too
(they are called as anaerobic bacterias search on google for more info)



hope it will be helpful to you
thank you