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A substance is toxic if it can cause death of an organism, or disruption to its normal ability to function (live, grow etc).
Examples of commonly known toxic substances include both inorganic substances, such as mercury, and organic substances, such as snake venoms.
However, it is obvious that many unlikely substances could, in fact, be toxic if taken in sufficient amounts: some people have died through drinking too much water, which the normal mechanisms of homeostasis have been unable to deal with.
Anne Evans
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