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the spread of cancer cells from the original (primary) malignant tumour to other parts of the...

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simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...

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very small organisms that are invisible to the naked eye.

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is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...

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a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...

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