A bacterium to which oxygen is cytotoxic is known as an obligate anaerobe.
The atmosphere in an area where a disease killed all the plants would not have any or very little oxygen. Trees would still produce some oxygen.
If humans killed ALL plants on earth, we would all suffocate. This is because plants convert co2 (carbon dioxide), which is exhaled by all animals, back into oxygen through photosynthesis. If they didn't convert co2, the earth's oxygen supply would depleat and we would fill the atmosphere with co2, and we would have no oxygen.
The more water moves the more it has a big surface of contact with the air with is rich in oxygen and therefore oxygenates the water. Also the movement makes that the deeper waters have a chance to get to the surface, exposing to the air part of water that would not be exposed otherwise.
we would die (because the meat eater dinosaurs would eat us or the plant eater dinosaurs would eat all the trees and trees produce oxygen
Exposing it to heat and UV light.
he would be killed
You would turn the collar on a Bunsen Burner so that the holes are exposing the flame to more oxygen to produce a blue flame. Close the holes by turning the collar to turn it back to the yellow (dirty) flame.
The interplanetary, interstellar, and even intergalactic word for oxygen would still be "oxygen".
the volturi sees that they outnumbered and that they're Powers are useless by Bella's shield so they decide to go to pike a fight with someone else
Oxygen would re-light a glowing splint
Of course. Ur not exposing ur self to anything you would not normally
Lack of diversity (inbreeding) exposing genetic weaknesses. A good example would be pedigree dogs.