Question

three sulfur metabolism processes a, b, c are shown. which one(s) represent lithotrophy? a: organic sulfur to h2s b: s0 to so4 c: h2s to s0

Explanation:

Lithotrophy involves using inorganic compounds as electron - donors. In the sulfur metabolism processes shown, the conversion of inorganic sulfur compounds like $H_2S$ to elemental sulfur ($S^0$) (process C) is an example of lithotrophy as it uses an inorganic sulfur - containing compound as an electron source. Processes A and B involve organic sulfur compounds or conversion between inorganic sulfur compounds in a non - lithotrophic way.

Answer:

C