Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Clan (African Great Lakes) Clan (African Great Lakes) In the African Great Lakes region, the clan is a unit of social organisation. It is the oldest societal structure in the region, other than family and direct lineage. The structure is found in modern-day Rwanda, Burundi, Tanzania and Uganda. The term "clan" was first used in the nineteenth century by Europeans, due to the similarities to other clan systems found across the world. The people of the area use a variety of vernacular terms to describe the concept: "ubwoko" in Rwanda, "umuryango " in Burundi, "ruganda" in the Bunyoro and Buhaya kingdoms, "igise" in Buha,