Source: Provided by the SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGEExamine the figure above, which shows indices of aquatic and terrestrial primary productivity. Based on concentrations of chlorophyll, primary productivity in the ocean
A. is usually high in warm, tropical seas.
B. is uniform, since the ocean is a single continuous body of water.
C. tends to be high near polar regions, due to seasonal mixing that redistributes nutrients.
D. is greatest in the open ocean, due to less air pollution and cloud cover.
E. tends to increase with increase temperatures, from the poles to the equator.
Answer: C
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