They are made of rock minerals and animal material
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Personally I think it should be: reevaluate the rate and volume of your ventilations
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<h2>Methylmercury is an organic shape of mercury. It is very toxic and is also the culprit in mercury poisoning. Methylmercury can be easily absorbed into the living tissue of aquatic organisms. This can cause disease and also can be fatal.</h2>
