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69 Stoffer der normalt ikke udgør nogen væsentlig del af de levende organismer,
men derimod især forekommer i det omgivende miljø. Blandt de uorganiske stoffer er rene grundstoffer, samt de forbindelser, som disse danner med oxygen. I biologien fokuseres især på følgende uorganiske stoffer som af planter, dyr og mikroorganismer optages eller udskilles i relativt store mængder: CO27(kuldioxid), H2O (vand), O27(oxygen), NO3-7(nitrat), NH4+7(ammonium), PO43-, (phosphat), K+7(kalium), Ca2+7(kalcium) og Mg2+(magnesium).
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