Which is the best way to prevent the spread of a viral infection? a. Vaccines
b. Antibiotics
C. Good hygiene
d. Drinking plenty of fluids

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.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.