It helps us breathe
Vegetation creates oxygen.
i think its boring
Oxygen is not addictive and causes no side effects when used as prescribed.
ummm... Oxygen's health effects are basicly breathing and all of the tools doctors use to help people breathe
there are no good effects.
Oxygen is main gas of earth. If there is no oxygen in the earth all the life in the earth should die.
There are no good effects. So get owned!
good effects of metals
what are the good effects of drugs
Pure oxygen is very harmful to humans at pressures higher than ground level, with the effects becoming worse the higher the pressure - ie. when scuba diving. At lower pressures, such as the cockpit of a plane at altitude, pure oxygen becomes much safer to breathe, to the point some astronauts have breathed it for around 2 weeks (at low pressure) with no detrimental effects.
Ph and temperature
They release oxygen.