While conducting random water sampling tests from a nearby estuary you measure higher than normal ammonia levels. you also measure an increase in nitrogen-fixing bacteria and blue green algae in the water. which of the following best explains why this is a good thing?

a. will lead to an increase in marine organisms
b. bacteria and blue-green algae convert ammonia into usable nitrogen
c. will provide evidence that the water is unhealthy
d. ammonia increases the productivity of an ecosystem