11 The diagram shows a piece of small intestine during peristalsis. direction of
peristalsis
What is happening at X?
circular muscles longitudinal muscles
А contracted contracted
B
contracted
relaxed
relaxed
contracted
D
relaxed
relaxed

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 answers are a and c