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(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...

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the main blood vessel that returns deoxygenated blood from the head and thorax to the right...

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water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.

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a form of environmentally-friendly farming in which farmland and soil are cared for so that it...

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a relationship between two different organisms, of different species, from which at least one of...

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