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simple chemical substances needed by the body in relatively small amounts for normal growth and development. They usually occur in the form of ions.
any disease that is caused by a virus or a bacterium or any other micro-organism.
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
remove starch from the leaves of a plant by preventing photosynthesis from occurring (for a few...