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Plankton• Passively drifting or weak swimming
organisms that cannot move independently of ocean currents.
Nekton• Organisms that can move independently of
ocean currents by swimming or other means of propulsion.
Intertidal Zone • The area where land and sea meet and
overlap; the zone between high and low tides.
Benthic Zone • Othe marine-life zone that includes any sea-
bottom surface regardless of its distance from shore.
Abyssal Zone • A subdivision of the benthic zone
characterized by extremely high pressures, low temperatures, low oxygen, few nutrients, and no sunlight.
Key Concept
• How can marine organisms be classified?–Marine organisms can be classified
according to where they live and how they move.
Key Concept
• What is the difference between plankton and nekton?–Plankton drift with ocean currents and
Nekton swim independently of the ocean currents.
Key Concept
• In which area of the ocean can most benthos organisms be found living?–Most benthos organisms are living on
or in the ocean bottom.