Answer: serve as a food source for other organisms
are used for medicinal purposes
produce oxygen
perform nitrogen fixation
cause disease
Step-by-step explanation:
Serve as a food source for other organisms: The cyanobacteria serves as a food for marine organisms like zooplanktons and fishes.
Are used for medicinal purposes: The cyanobacteria are used for the purpose of medicine these produced biologically active materials such as antiviral, antifungal, antibacterial and anticancer activities.
Produce oxygen: The cyanobacteria produces oxygen by the process of photosynthesis.
Perform nitrogen fixation: The Cyanobacteria produces nitrogen form that is absorbed by the plants. It converts the atmospheric nitrogen into the ammonia absorbed by the plants.
Cause disease: The cyanobacteria produces cytotoxin which is responsible for neurodegenerative diseases like Parkinson's disease, and Alzheimer's disease.