Correct, Oxygen makes up about 21% of the air., Nitrogen helps plants grow., Air has no colour, no smell, and no taste., Other gases make up about 1% of the air., Carbon dioxide helps plants with photosynthesis., Incorrect, Carbon dioxide makes up about 21% of the air., Nitrogen keeps a fire burning., Oxygen makes up about 78% of the air., Air has a sweet smell., Plants use oxygen for photosynthesis.

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