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Subject:

substance used to test for the presence of starch. It is a mixture of elemental iodine,...

ion
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an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...

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biological, chemical, or physical agent that stimulates a characteristic function or causes a...

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small groups of cells found in the pancreas that secrete the hormones insulin and glucagon.

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two or more forms of a particular  chemical element, that have the same number of protons in the...

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