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Caption: Lichen. Unidentified lichen growing on granite. A lichen is a symbiotic organism comprising an alga and a fungus. The alga produces carbohydrates for the fungus by photosynthesis, and the fungus protects the alga from harsh conditions. Lichens are highly sensitive to pollution: several are used as indicator species for sulphur dioxide levels in the atmosphere. Photographed on the coast of Queen Victoria Island, Canada.

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Keywords: alga, botany, canada, canadian, coast, coastal, fungus, granite, lichen, lichens, mutualism, nature, plant, queen victoria island, rock, symbiosis, symbiotic organism

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