Chapter 4, Ecosystems and Communities - Assessment - Connecting Concepts - Use Science Graphics/Write About Science - Page 126: 34

Although the open ocean is the least productive of all the ecosystems, it contributes much to the biosphere because oceans cover so much of the earth that adding the productivity of all the oceans in the world amounts to a huge number.

Although the open ocean is the least productive of all the ecosystems, it contributes much to the biosphere because oceans cover so much of the earth that adding the productivity of all the oceans in the world amounts to a huge number.