Lead is increasingly found in drinking water in many parts of the world stemming from industrial processes as well as geochemical mechanisms, it is regarded as highly toxic metal ions to a wide variety of {HEAD ~ organs} in {TAIL ~ both humans} and animals, including nervous, immune, reproductive, gastrointestinal systems 
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Lead is increasingly found in drinking water in many parts of the world stemming from industrial processes as well as geochemical mechanisms , it is regarded as highly toxic metal ions to a wide variety of { HEAD ~ organs } in { TAIL ~ both humans } and animals , including nervous , immune , reproductive , gastrointestinal systems
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