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Diatoms are one of the most important and abundant components of marine phytoplankton with two valves (frustules) composed mainly of of silica (SiO2). Very important for palaeoclimatic reconstruction (environmental conditions), marine biology and ecology, and industry.Inhabit all aquatic environments. They occur in the body of the water as plankton or on the bottom where they may be attached to plants or rocks or sand particles, or may be free living and able to move between particles of the s22
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