Protists, single-celled eukaryotic organisms encompassing unicellular algae and protozoans, inhabit aquatic environments. Functioning as primary producers and oxygen generators, they play crucial roles in the carbon cycle and serve as vital sources of human nutrition, bioenergy, and food for aquatic animals. However, they can also pose challenges, causing harmful algal blooms and red tides, acting as both pathogens and beneficial partners in symbiotic relationships.
