Label the picture. Write the name next to each letter.
A loop of five stops, joined by arrows that go round in a circle. Food goes in to a fish. The fish gives off ammonia through its gills. An arrow labeled bacteria turns ammonia into nitrite. A second arrow labeled bacteria turns nitrite into nitrate. An arrow labeled roots carries the nitrate to a plant. An arrow labeled cleaner water runs from the plant back to the fish. Each chemical is a circle with its formula: N H 3 for ammonia, N O 2 with a minus charge for nitrite, and N O 3 with a minus charge for nitrate.
A · fish
B · ammonia
C · nitrite
D · nitrate
E · plant
Answer in your own words.
Which one is safest for fish?
What do the Munchers make?
Why does a system need lots of Finishers?
Draw or explain
A relay race needs every runner. What happens to the cycle if one kind of bacteria is missing?