The following table lists the global annual values of ecosystem services provided by selected major ecosystems, along with the total area of the globe occupied by each ecosystem type. (Areas are in...

The following table lists the global annual values of ecosystem services provided by selected major ecosystems, along with the total area of the globe occupied by each ecosystem type. (Areas are in hectares; a hectare equals 2.5 acres.) Study the table and then answer the questions that follow it.

The value per hectare for open oceans is the lowest on this table. Why do you think the global total value for open oceans is one of the highest? Explain.