Bacteria at deep sea vents obtain energy by oxidizing hydrogen sulfide. They would be classified as which of the following?

W) Photoautotrophic [photo-auto-TROH-fik]

X) Chemoautotrophic [kee-moh-auto-TROH-fik]

Y) Photoheterotrophic [photo-hetero-TROW-fik]

Z) Chemoheterotrophic [kee-moh-hetero-TROH-fik]
X) CHEMOAUTTORPHIC