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the way in which cells multiply to form new cells.
the acidic fluid secreted into the mammalian stomach which contains various digestive enzymes...
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.