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The smallest unit of a compound is a molecule, which is made up of atoms held together by bonds.
Answer:
Biological stains are used for the medical and biological industries to aid in detection of structures within tissues. This can include the detection of abnormalities, but is not limited to that. The stains are used to define and examine cell populations within the tissues, to mark cells, or to flag proteins.
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Postassium bisulphate - KHSO4 - can be used as an food preservative to protect the food from micro-organisms.