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Flora. bladder wrack. kelp. algae. sea grass. knotted wrack. Plant species in the North Sea include species of wrack, among them bladder wrack, knotted wrack, and serrated wrack. Algae, macroalgal, and kelp, such as oarweed and laminaria hyperboria, and species of maerl are found as well. Eelgrass, formerly common in the entirety of the Wadden Sea, was nearly wiped out in the 20th century by a disease. Similarly, sea grass used to coat huge tracts of ocean floor, but have been damaged by trawling and dredging have diminished its habitat and prevented its return. Invasive Japanese seaweed has spread along the shores of the sea clogging harbours and inlets and has become a nuisance.Картинка 26 из презентации «The North Sea»
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«Periodic table of elements» - Ni + Cl2 = NiCl2. Ni + 4HNO3 = Ni(NO3)2 + 2NO2 + 2H2O. At the moment, the biological role is not clear. 3Co + C = Co3C. chemical properties. physical properties. 2Ni + B = Ni2B. Co + 2H2SO4 = CoSO4 + SO2 + 2H2O. The human need for cobalt 0,007-0,015 mg daily. It is a part of vitamin B12 (cobalamin).
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