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used engine oll, 7 Give any one way of protecting ‘community water sources from State any two ways in which the cutting of wood for timber Apart from bees, mention any two other examples of insects Questions 41 to 55 carry four marks each, that pollinate flowers. State any one effect of water pollution on human health. a slow rate? pollution. Give a reason why timber for roofing houses should be treated with a) _ a) What term refers to the keeping of timber In a shade to allow it dry negatively affects the environment . 43. 42.