You will die
Life on Earth, or at least most of it, would not exist without free oxygen. It is possible that some other form of life, based on another element, could exist in a non-oxygen environment. But none has been discovered as of now.
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
It contracts?
Alkali earth metals react with oxygen to form basic oxides.
Oxygen, Nitrogen and Carbon dioxide, in that order. The most important element to sustaining life is Oxygen.
the earth would die
we would be dead
If the sun exploded it would not give us oxygen; it would simply vaporize Earth.
no air and no oxygen
all human and animal activity would die
Some Bacteria do not need and will even die in the presence of oxygen. They would thrive and probably evolve.
we well not get oxygen and all earth get die
Humans would die, because plants make our oxygen
we will die because there is no oxygen to breathe in
The thick atmosphere has enough oxygen so than living things can happen.
if there is no plants humans cant get oxygen so naturally people cant exist on earth
most plants and animals would die due to the lack of food and oxygen