Which aquatic ecosystems are composed of salt water? Select four options.

intertidal zones
neritic zones
open ocean
streams
coral reefs

intertidal zones

neritic zones

open ocean

and coral reefs

Explanation:

i took the test also if you just look up these things separate then you will get your answers

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.