Question

how do autotrophs obtain co2 and n2 to make their foood

Answer 1

the autotrophs which are called green plants take seo2 from the atmosphere and N2 from the soil to make their own food

Answer 2

autotrophs obtain CO2  directly from atmosphere through stomata .
they obtain N2 by roots. here nitrogen is absorbed by the soil and it is changed into the N2 by root nodules. thus they obtain CO2 and N2 to make their food