Which landform represents a flowing, moving stream of water that feeds into an ocean?

A river.

The definition for river is "a large natural stream of water flowing in a channel to the sea, a lake, or another such stream."

However, in your question you asked for a 'land form', but you also asked for a 'stream of water'. This confused me slightly, so please let me know if I did not interpret the question you were asking correctly. Also, a river is a stream of water, however, is not a landform.

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