If a baby does not get enough oxygen it's brain could be damaged or it could die. The same would be true for an adult.
We would all die. As there won't be enough oxygen for us to breathe in.
the earth would die
Some Bacteria do not need and will even die in the presence of oxygen. They would thrive and probably evolve.
In the presence of fluorine (a reactive gas), steel wool will rapidly combine with the fluorine and any oxygen to generate substantial heat, possibly enough to burst into flames.
most plants and animals would die due to the lack of food and oxygen
not enough oxygen poor blood would enter the heart
not enough oxygen poor blood would enter the heart
We would all die. As there won't be enough oxygen for us to breathe in.
Aerobic respiration will be stopped. Body will not get enough energy
there would be no oxygen
If you did not have any oxygen you would die very soon.
we would be dead
Hemoglobin in blood carries about 280 ml of oxygen/ liter. That bond is tight enough to carry oxygen and loose enough to give at pressure gradient difference. If erythropoiesis does not occur in body you can carry only 4 ml / liter of oxygen/ liter in body and you will not survive with such a low supply of oxygen.
if the oxygen
If all humans suddenly disappeared from Earth, the oxygen content of the atmosphere would gradually increase due to the lack of human respiration and combustion processes. This could potentially lead to a temporary surge in oxygen levels until natural processes balance out the concentration.
your organs would die
We would not have enough oxygen.