Charlotte extends her left calf muscle then relaxes it, concentrating on the tension leaving the muscle as she does so. Charlotte then tenses and relaxes her left quadriceps, again noting the flow of tension from the area. Charlotte is engaged in:

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.

the answer is 1. photosynthesis. glad to