Nitrogen-fixing bacteria convert atmospheric nitrogen into forms of nitrogen that living things can use. Please select the best answer from the choices provided
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an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

they deliver oxygen to the blood

i wish i could with all of them i can barley see the first one so here's the answer to the first one b