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What was used as an ancient poison but it's a necessary nutrient in our body

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Answer:

Arsenic was used as an ancient poison but it's a necessary nutrient in our body.

Step-by-step explanation:

  • Recent studies have suggested that arsenic has a physiological importance.
  • Fish, grain and cereal products contribute most arsenic to the diet.
  • The estimation of a possible human requirement is 12 micrograms per day

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