This element’s namesake globules are studied in the model organism Allochromatium vinosum. Bacteria that reduce compounds of this element were likely displaced by vertical burrowers during the Cambrian substrate revolution. This element is enriched at the bottom of Winogradsky columns. (10[1])Compounds of this element are metabolized by endosymbionts in Alviniconcha mollusks and the trophosomes of Riftia pachyptila. Deep meromictic lakes are rich (10[1])in this element’s namesake “green” and “purple” bacteria (-5[1])that use it as a non-oxygen electron acceptor. (10[1])According to Günter Wächtershäuser, minerals of iron and this element were the platform for early organismal evolution near hydrothermal vents. For 10 points, name this element that often emits a rotten smell. ■END■ (10[2])