Question

how do autotrophs obtain CO2 and N2 to make their food

Answer 1

Hey
1)Autotrophs obtain CO2 from organisms like us who take in O2 and give out CO2 .
2) They obtain NO2 from soil which is fixed by nitrogen fixation process by micrograms.
Hope it helps
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Answer 2

Autotrophs obtain Carbondioxide from the atmosphere and they obtain Nitrogen from the soil.Nitrogen fixing bacteria convert atmospheric nitrogen into suitable form so that the autotrophs can use.