"Zero Oxygen"

Alright, so what would if just suddenly all breathable oxygen vanished one day? What effect would it have on Earth and its atmosphere? How would it affect us? How could we survive (oxygen tanks)?

We wont survive inspite of how many tanks we have. It wont be enough.NO TREES = MORE CARBON DI OXIDE = No oxygen = NO LIVING BEINGS = EARTH IS DEAD. Then after the Earth is wiped out. The microscopic organisms start the evolution by absorbing carbon dioxide and producing oxygen.

All forms of life will be simply withered. Die. Vanish. Gone. Feel free to add another better term to decribe apocalypse.

If there is an eventual regression of oxyegen in the Earth's atmosphere then there may be some survivours. However if it is gone suddenly then you are looking at widespread devastation. Of course there will still be living organisms such as bacteria which live on the depths of the oceans etc. But this situation of yours is a little scary so I think I'll avoid going into detail lol.

Only microbic organisms could survive, and mutate. So, PLANT TREES!!

Earth would get destroy . . .

Then new life will occur

And then it will take thousands of years to evolute a new species.