In order to maintain life, organisms must produce, modify, transport, and exchange materials. what is this process called?

homeostasis

is a noun

the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.

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.

they deliver oxygen to the blood