The diagram below represents the nitrogen cycle in a student's aquarium. Ammonia, nitrites, and, to a lesser degree, nitrates can be harmful to fish. The student wants to keep the
nitrogen in this aquarium cycling normally without having to continually change the water.
CO
Carbon dioxide
Carbon dioxide (CO)
and ammonia (NH)
Ammonia
Fish
and food
Nitrates
(NO)
Nitrites
(NO)
o
Removed by
plants and water
changes
Nitrobacter
(bacteria)
Nitrosomonas
(bacteria)
Which of the following should the student add more of to help remove nitrates and improve
the natural cycling of nitrogen in this aquarium?
A Fish
B Plants
C Nitrobacter
D Water