Which of the following describes mechanosenory feedback?

1. a form of merging significantly denser salt water that is created from the tectonic movement of large salt deposits

2. a scientific study concerning the exploration of newly found organisms on this planet as well as burgeoning exoplanet research

3. a process brought about due to volcanic upheaval; the undersea equivalents of terrestrial mountains that rise from the sea bottom and do not break the surface of the water

4. a method used by tripod fish, because of their blindness, in which subtle turbulence clues help the fish sense prey