Which organism in this diagram is a tertiary consumer?
A. Shrimp
B. Phytoplankton
C. Person
D. Salmon

c

Explanation:

we are also considered tertiary consumers since we're on top of the food chain

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.