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movement of the Earth's continents as the Earth's tectonic plates shift.
a disease caused by the bacterium Vibriocholera, which produces a toxin in the lining of the...
structure surrounding plan tcells i tgives cells rigidity and strength.
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...