Which of the following requires the least amount of energy? a. gaining an electron b. losing two electrons c. losing four electrons d. losing an electron

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.

d) center of the mid-ocean ridge

give brainleysest

sinserly,

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