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<p>non-essential trace elements. Essential trace elements are needed for many physiological and biochemical processes in both plants and animals. Not only do trace elements play a role in biological processes but they also serve as catalysts to engage  in <a href="page.php?w=redox">redox</a> - oxidation and reduction mechanisms. Trace elements of some <a href="page.php?w=heavy_metals">heavy metals</a> have a <a href="page.php?w=Heavy_metals">biological role</a> as essential <a href="page.php?w=micronutrient">micronutrient</a>s.</p>

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