Answer:
Cyanobacteria
Explanation:
Cyanobacteria (also known as blue-green algae) are a group of prokaryotic organisms composed of photosynthetic bacteria. Cyanobacteria are important in the nitrogen cycle. Some cyanobacteria are capable of fixing atmospheric nitrogen into organic compounds such as, for example, nitrate or ammonia. Subsequently, plants can use these nitrogen sources to grow, which they obtain from the soil. The process of nitrogen fixation (nitrification) is produced in anaerobic conditions by specialized nitrogen-fixing cells called heterocysts.
