Question

what is the difference between metals we find in our body and in nature

Answer 1

Human body is composed of almost every natural element found in nature. This is also true for metals as it is for water or carbon. But there is difference between the metals found in nature and metals we find in the human body. We can understand this difference by the following paragraph.
Iron that we see at any construction site is usually a refined piece of metal commonly called pig iron. Pure iron is pretty much non-existent in nature, the only known example coming iron meteorites. Most of the iron found on the Earth is in some form of iron oxide or iron ore. This iron ore is extracted from the mines and then shipped to refineries where it is made into iron alloys or steel by mixing it with other elements like carbon and manganese. The iron in our blood is usually complexed with oxygen in hemoglobin, but a large majority is also stored as ferritin, as free iron is toxic to our body. Both human body and nature contain iron but neither is completely pure. Oxidation states vary and covalent linkage to different elements depends on the purpose the iron is serving. 
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Answer 2

human body is composed of almost every natural element found in nature. It is also true for metals as it is for water or carbon. But there is the difference between the metals found in nature and the metals which are found in the human body. But human body and nature contain iron but neither is completely pure....
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