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Acids have a pH under 7 and have extra electrons or molecules they are ready to loose in a chemical reaction, which means they are positively charged.

Biologically most of lifeforms are mainly water, which is an acid itself. Water and the other acids in the body, like the hydrochloric acid in the stomach, serve many purposes, such as digestion, lubrication, antiseptic properties... For a more detailed explanation you'd pretty much have to look up just about every liquid in the body.

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Q: What are the properties of acid and its biological significance?
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