Which step of the nitrogen cycle occurs only in aquatic ecosystems? A. Cyanobacteria convert nitrogen into ammonium
B. Soil bacteria convert nitrogen into ammonium
C. Soil bacteria convert ammonium into nitrate
D. Ammonium enters the ecosystem when humans fertilize soil
E. Nitrates enter the ecosystems when humans fertilize soil

An ecologist is studying the effects that a population of predators is having on a population of a prey. he used data from the field to produce this graph. which conclusion can draw from the graph?

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

45 points how are people today being protected from tsunamis? earthquake data is analyzed to detemrine if a tsunami is likely, and if so, warnings are sent out. areas in tsunami risk zones are no longer heavily populated. radar is used to measure wave heights regularly. meteorologists study the winds to determine if wave heights will be large.