Respiration in heterotrophs is often accompanied by mineralization, the process of converting organic compounds to inorganic forms. When the organic nutrient source taken in by the heterotroph contains essential elements such as N, S, P in addition to C, H, and O, they are often removed first to proceed with the oxidation of organic nutrient and production of ATP via respiration. S and N in organic carbon source are transformed into H2S and NH4+ through desulfurylation and deamination, respectively. Heterotrophs also allow for dephosphorylation as part of decomposition. The conversion of N and S from organic form to inorganic form is a critical part of the nitrogen and sulfur cycle. H2S formed from desulfurylation is further oxidized by lithotrophs and phototrophs while NH4+ formed from deamination is further oxidized by lithotrophs to the forms available to plants. Heterotrophs’ ability to mineralize essential elements is critical to plant survival.