Final answer:
Marine ecosystems, the majority of Earth's surface, comprise shallow ocean, deep ocean water, and deep ocean bottom types, supporting diverse life forms.
Explanation:
Marine ecosystems are the most common, comprising 75 percent of Earth's surface and consisting of three basic types: shallow ocean, deep ocean water, and deep ocean bottom. Shallow ocean ecosystems include extremely biodiverse coral reef ecosystems. Small photosynthetic organisms suspended in ocean waters, collectively known as phytoplankton, perform 40 percent of all photosynthesis on Earth. Deep ocean bottom ecosystems contain a wide variety of marine organisms.
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