sec 2 life in the ocean

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photosythasis
The process by which green plants, algae, diatoms, and certain forms of bacteria make carbohydrates from carbon dioxide and water in the presence of chlorophyll, using energy captured from sunlight by chlorophyll, and releasing excess oxygen as a byproduct. In plants and algae
chemosynthesis
Synthesis of carbohydrate from carbon dioxide and water using energy obtained from the chemical oxidation of simple inorganic compounds. This form of synthesis is limited to certain bacteria and fungi
plankton
the aggregate of passively floating, drifting, or somewhat motile organisms occurring in a body of water, primarily comprising microscopic algae and protozoa.
nekton
the aggregate of actively swimming aquatic organisms in a body of water, able to move independently of water currents.
benthos
the biogeographic region that includes the bottom of a lake, sea, or ocean, and the littoral and supralittoral zones of the shore.
estuary
hat part of the mouth or lower course of a river in which the river's current meets the sea's tide.
reef
a ridge of rocks or sand, often of coral debris, at or near the surface of the water.