What did each of the bottles represent? What does the water represent?

You need to add a picture but uhh ok

Explanation:

The bottles represent the left and right sides of the heart. The water represents blood that flows through the circulatory system.

Explanation:

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.