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the osmotic pressure that develops within the cells of a root system that causes the sap to rise up through a plant stem to the leaves.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
specialised cells which secrete mucus, usually found together with columnar epithelium and...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...