medium · SAT Reading & Writing
The 1977 discovery of hydrothermal ______ long-standing assumptions about where life on Earth can survive. Which choice completes the text so that it conforms to the conventions of Standard English?
- vents, openings on the seafloor that gush superheated water, upended
- vents, openings on the seafloor that gush superheated water — upended
- vents — openings on the seafloor that gush superheated water, upended
- vents openings on the seafloor that gush superheated water, upended
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