Selenium is a naturally occurring metalloid element, which is essential to human and animal health in trace amounts but is harmful in excess. Of all the elements, has one of the narrowest ranges between dietary deficiency (< 40 μg day-1) toxic levels (> 400 μg day-1) making it necessary to carefully control intakes by and other animals hence the importance of understanding the relationships environmental exposure and health
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F.M. Fordyce (2007) studied this question.
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