Any particular element can always be identified by its

Number of protons

Explanation:

Any particular element can always be identified by its number of protons.

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.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully