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specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions in living organisms.
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...
the area that occurs between the high water and low water marks. It is exposed to the air at low...
a disease caused when the body's immune system destroys other body cells.
a plant body consisting of one or more cells. It is not differentiated into root, stem and...