PPT Slide
It is possible to estimate plant and fish productivity in the ocean.
Upwelling of deep, nutrient-rich water supports large populations of phytoplankton and fish.
The waters of the neritic zone are fertile and support a rich community of organisms.
The open ocean is the largest habitat on Earth, but life is sparse because of low nutrient concentration and great depth.
The biomass on the sea floor tends to decrease with depth faster than it does with distance from shore.
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