Which of the following statements about passive transport is true? Choose 1 Choose 1 (Choice A) A Passive transport refers only to the movement of water. (Choice B) B Energy input is required. (Choice C) C Substances move along their concentration gradients. (Choice D) D Membrane proteins are always needed.

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

not only is it colder, it also becomes darker, less salty, and more dense.