I don’t know how to do this

The answer is a shark

There are three types of nekton. The largest group of nekton are chordates and have bones or cartilage and this group includes bony fish, whales, sharks, turtles, snakes, eels, porpoises, dolphins and seals. Molluscan nekton are animals like octopus and squid

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

the answer is trees if i'm not mistaken