Titan triggerfish feed on coral, which is often buried under rocks on the sea floor. to access the coral, these fish turn over rocks. it has been shown that the absence of the titan triggerfish changes the population levels of other species of fish that live in the same coral-reef environment.

smaller fish species are benefited by the titan triggerfish. the triggerfish are nether harmed or helped

the relation is commercialism

Explanation:

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

genetic variation will increase because of a new habitat and food source.

explanation: