The precentage of oxygen in the air does not change because
a. oxygen is not used in any natural process
b.oxygen used up in natural processes is negligible.
c.oxygen used up in some natural processes in renewed by another natural process
d.oxygen used up in natural processes is replenished by the ozone layer.
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Answer:Oxygen used up in some natural processes is renewed by another natural process. The percentage of oxygen in the air does not change because the oxygen used in respiration and combustion is replaced by the oxygen generated by plants during photosynthesis.
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An example of noise. two word
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