Which of the Following Statements About Ocean Productivity Is True

Multiple Choice

Which of the following statements about ocean productivity is true?

A) Productivity decreases in upwelling zones because the colder temperatures of the waters slow the process of photosynthesis.
B) Ocean productivity is highest in the aphotic zone.
C) Sunlight and the availability of nutrients are two factors that regulate ocean productivity.
D) Limestone calcium carbonate) is the source of carbon that enters the marine food web.