How do autotrophs obtain CO2 and N2 to make their own food?

Explanation:

CO2 is obtained directly from atmosphere through stomata. N2 can't be taken directly from atmosphere hence it is converted into nitrites and nitrates by process called nitrogen fixation

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.