MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Rivularia cyanobacteria, polarized light micrograph. Cyanobacteria are a photosynthesising form of bacteria. They were among the first lifeforms to appear on Earth, and oxygenated the atmosphere. They are found worldwide in most habitats, including oceans, fresh water, and soil. Magnification: x400 when printed at 10 centimetres wide.
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