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
Sarah (given name) Sarah (given name) Sarah is a Hebrew feminine given name found in many different areas of the world. Sarah is a consistently popular given name across Europe and North America, as well as in the Middle East—being commonly used as a female first name by Jews, Christians and Muslims alike, and remaining popular also among non-religious members of cultures influenced by these religions. Frequently, the name refers to Sarah, the wife of Abraham in the Hebrew Bible, the Christian Old Testament, and the Islamic Quran. In Arabic, Hebrew, and Persian, it means "woman of high rank", often simply translated as