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Where do clouds form? Select three options.

at the ground
in the upper atmosphere
near the Earth’s surface
where the air has very low humidity
where the atmosphere contains few particles

at the ground, in the upper atmosphere, and near the earth's surface.

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.