If a scientist found a beaker of a substance in a lab, which of the following would the scientist most likely use to identify the substance? A. taste, smell, touch and sound
B. Melting point, ability to burn, boiling point and density
C. Poking, prodding, pouring and partaking
D. Research on Wikipedia

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.

i'll try what topic lol