Which is the process by which gas exchange between the respiratory system and the blood cells in the cappilaries occurs?
transfusion
condensation
O evaporation
diffusion
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thic and return

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

because of