All of these chemical compounds and elements occur in various forms and combinations ( e. g. hormones, vitamins, phospholipids, hydroxyapatite ), both in the human body and in the plant and animal organisms that humans eat.

All of these chemical compounds and elements occur in various forms and combinations ( e. g. hormones, vitamins, phospholipids, hydroxyapatite ), both in the human body and in the plant and animal organisms that humans eat.

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