How do autotrophs obtain CO 2 and N 2 to make food?

Autotrophs obtain CO 2 from the atmospheric air that is given out by plants and animals during respiration. N 2 can not be taken directly from the atmosphere. Hence, it is converted into absorbable forms like nitrites and nitrates by a process called nitrogen fixation and then these are absorbed by the autotrophs.

How do autotrophs obtain CO 2 and N 2 to make food?

Autotrophs obtain CO 2 from the atmospheric air that is given out by plants and animals during respiration. N 2 can not be taken directly from the atmosphere. Hence, it is converted into absorbable forms like nitrites and nitrates by a process called nitrogen fixation and then these are absorbed by the autotrophs.