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Bioelementele sunt elemente care intra in compozitia materiei vii.Cele mai importante bioelemente din organismul uman,la fiecare suta de atomi,sunt:H(63); O(25,5); C(9,5); N(1,4); Ca(0,31); P(0,22); Cl(0,08); K(0,06); S(0,05); Na(0,03); Mg(0,01)ect.

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