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substances such as elements or compounds, that cannot be broken down into simpler substances by...

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a factor that makes people leave an area

PVA

polyvinyl acetate, a colourless thermoplastic material used in inks and adhesives.

PVC

polyvinyl chloride, a white material often used in paints.

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a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...

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