In 1952, Rosalind Franklin took an X-ray photograph (shown above) revealing the structure of DNA. James Watson and Francis Crick followed up on this discovery in 1953. They discovered
that the molecule has a shape specific to just that molecule,
That shape can best be described as -

idk

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.