They use them as food and habitats.
There are multiple energy source in the ocean. The one thats probably the most common one are Dams. Although Dams can cause some serious flooding. Another one is Tidal energy. Tidal energy is something that turns the energy of tides into energy through Kinetic motion.<span />
Incorrect and false
Humans have innate behaviors and these are exhibited as instinctive behaviors that acts as an impulse, drive or impetus without a rational guidance. These are survival behaviors that aid to the individual's own growth in the harsh environment.