Tissue analysis following autopsy on polar bear that died noted to have significant level in most of the bear. It is due to food chain where migratory bird dropping taken up by small fish, accumulate in bigger fish, and accumulate further in polar bear tissue. Similar and even worst chain of mercury continuously affecting us from sea food due to human activities in land. Presence of mercury in nine out ten cod liver oil in pharmacist explain the food the food chain effect. Unscrupulous dumping may cause acute poisoning such as what happenned in Minamata Bay in Japan. Chronic low level mercury and other heavy metals are rampant. In a study 290 out of 300 blood sample of chord blood of newborn baby contain significant level of chemical and some heavy metals.

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