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Dejanras

Answer is: b. air.

Homogeneous mixture (air) has the same proporties of its components (nitrogen, oxygen, carbon dioxide) throughout any given sample.

Together, nitrogen (N₂) and oxygen (O₂) by volume account for 99,03% of the gases composing the dry air in the lower atmosphere.

Volume of nitrogen in air is 78,08%.

Volume of oxygen in air is 20,95%.

Together: 78,08% + 20,95% = 99,03%.

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