Is the human heart found inside or outside the ribcage

Inside the rib cage, in the pericardial cavity.

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 otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.