Question

$question - \\ \\ \\ \\ what \: is \: mean \: by \: air$
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Answer 1

Answer:

Air is the invisible mixture of gases that surrounds the Earth. ... Nitrogen and oxygen make up about 99 percent of Earth's air. People and other animals need oxygen to live.

Answer 2

Answer:

Air is a invisible mixture gas It mainly contist of three main gases Nitrogen (78%) Oxygen(21%) Carbon dioxide (0.04%).