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
Nipissing Great Lakes to with a mean stage of water about . The name "Nipissing beach" has from the first been applied to the shoreline formed during the two-outlet stage of the lakes. The name more precisely belongs to the older beach made by the Nipissing Great Lakes when the whole discharge passed through the Ottawa River. After the formation of the true Nipissing beach isostatic rebound elevated the region. This lowered the water plane on the north side of the basin and raised it on the south side. Thus the beach from the earlier stage of the Nipissing Great Lakes in the