The voltage produced by a power generating device such as a battery or illumniated photovoltaic cell when not connected to an electric circuit. Materials of animal or vegetable origin. Residues derived from living organisms. Oxidation-reduction reactions are an important means of energy transfer within living systems. To combine or supply with oxygen.
Ozone is a poisonous gas and an irritant at the earth's surface, capable of damaging lungs and eyes.
But the ozone layer in the stratosphere shields life on earth from deadly ultraviolet radiation from space.