Ecosystems Based on Chemoautotrophic Prokaryotes Occur Around Deep-Sea Hydrothermal Vents

Multiple Choice

Ecosystems based on chemoautotrophic prokaryotes occur around deep-sea hydrothermal vents at 2,500 m below the ocean surface.These bacteria

A) obtain energy from sunlight.
B) obtain energy as endoparasites of giant worms.
C) obtain energy by oxidizing hydrogen sulfide.
D) oxidize organic compounds for energy.
E) obtain energy by reducing heavy metals.