First respiration arose on earth was
Anaerobic
Aerobic
$(a) $ and $(b) $ both
Cellular respiration and as a respiratory gas
It's Obvious
The first life on earth came in water and evidences indicate that life orginated in one of the following eras
Krebs' cycle, glycolysis, lipogenesis, enzymes, all of these indicates
The ratio of methane, ammonia and hydrogen in Stanley Miller's experiment was
Why is nascent oxygen supported to be toxic to aerobic life forms ?
Choose the correct pair.
