which is the most abundant element in air?, oxygen, nitrogen, carbondioxide, other gases, what type of substance is air?, solution, colloid, pure substance, mixture, which element helps in photosynthesis?, oxygen, carbondioxide, flourine, nitrogen, which element helps is respiration?, oxygen, carbondioxide, nitrogen, helium, what is the percentage of nitrogen present in air?, 71%, 79%, 23%, 21%
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