Which of the following statements about the first scuba diving suit is true?

a. it weighed about 100 pounds

b. it was made in the 1950's

c. it weighed about 50
pounds

d. it was made in the 1870's

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.