Experiment: Will the amount of water given to a plant affect how high it grows? What is the independent variable (test variable)?

A. amount of water

B. plant growth

A , amount of water

Explanation:

How high the plant grows depends on how much water it is given

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

it's c. (to reduce the greenhouse effect/carbon gasses)