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It is the element symbol O which represents oxygen.
Create a unique gold-aluminum alloy, which can only be made in a zero gravity environment, and which has an amazing green color.
when you inhale air into your lungs the concentration of oxygen in the blood can be no greater than that in the air.As the blood reaching the lungs is lower in oxygen there is transfer from the air to the blood stream until the concentrations stabilise.However there is no active transfer.Therefore there will always be Oxygen in exhaled air even if the initial oxygen concentration in the blood is zero as the air oxygen and the blood oxygen will reach a steady state equilibrium
No,leeches can not live in hot water.