Why are scientists so interested in the organisms living next to black smokers?
A. The scientists didn't think photosynthesis could occur in such deep water.
B. The organisms appear to originate from within mantle and are brought to the surface through convection.
C. The entire food web is based on silicon instead of carbon.
D. The organisms may represent some of Earth's earliest life forms, or even possible life on other planets.
Answer: D
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