How do humans continue to maintain stable internal environment if billions of cells die within their bodies each day

The cells must be able to reproduce.

Explanation:

Study Island Answer

i think its c. amphipod

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.