sentence: Microorganisms are critical to nutrient recycling in ecosystems, because they act as decomposers.
sentences_after: Because some microorganisms can also take nitrogen out of the air, they are an important part of the nitrogen cycle. Pathogenic, or harmful, microbes can invade other organisms and cause disease.
concept_name: microorganism
headings: Microorganism
categories: Microbiology Protista Prokaryotes