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 is the use of inorganic compounds as electron - donors for energy production. In the sulfur metabolism processes shown, process C represents the conversion of hydrogen sulfide ($H_2S$) to elemental sulfur (S), which is a lithotrophic process as $H_2S$ is an inorganic compound. Processes A and B involve organic sulfur compounds or the conversion between sulfur - containing inorganic compounds in a non - lithotrophic context.

Answer:

C