CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Conceptual illustration of cyanobacteria. Cyanobacteria live in water and produce their own food by photosynthesis. They form the oldest fossils, dated at 3.5 billion years old and still remain one of the largest and most important group of bacteria on earth. During periods of rapid growth called blooms, cyanobacteria can produce the toxin microcystin. Black=carbon, white=hydrogen, red=oxygen, blue=nitrogen.
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