If the same base pairs are used to code for all organisms, why is there so much vairation among organisms

it supports cell theory.it states that all living cells are made from cells

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 don’t no. suiopgohjk