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the development of a distinct head, with a concentration of nervous tissue and sense receptors at one end, known as the anterior end of an animal.
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
the seepage of acidic, contaminated water from disused mines and mine dumps.
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...