Life in the Polar Regions is harsh: during the summer season, organisms experience continuous sunlight, combined with relatively high levels of ultraviolet radiation, whereas during the winter temperatures permanently drop (far) below 0 °C and there is no sunlight for months on end. Consequently, the number of macroscopic plant and animal species living in the Polar Regions is small compared to the rest of the planet. Nevertheless, the Polar Regions harbour a huge diversity of microscopically small life.
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