What type of microscopic organism is responsible for the pink-tinted phenomenon known as watermelon snow?
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Watermelon snow is caused by Chlamydomonas nivalis, a species of green algae that thrives in freezing water. The red color comes from a carotenoid pigment that protects the algae from intense solar ultraviolet radiation, which also gives the snow a faint watermelon-like scent. Photo: Paul Wade. Pacific Southwest Region 5, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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