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

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

very small organisms that are invisible to the naked eye.

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

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