Question

14 multiple choice 1 point
why are bacteria essential to the nitrogen cycle in aquatic ecosystems?
all choices are roles of bacteria in the nitrogen cycle.
some bacteria use nitrate for energy instead of oxygen and can return nitrogen gas to the atmosphere.
bacteria convert nitrogen gas into more usable forms that plants can absorb through their roots.
bacteria help break down decomposing plants and animals to return the mineral to the cycle.

Explanation:

Bacteria play multiple roles in the nitrogen cycle. They fix nitrogen gas, decompose organic matter, and some perform denitrification.

Answer:

A. All choices are roles of bacteria in the nitrogen cycle.