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An area of land that is drained by a river or other body of water
Falling or lowering tide
Group of primitive, non-flowering plants which include certain seaweeds and microscopic phytoplankton
Low, wet grassland without trees, periodically covered by water
Mixture of fresh and salt water
Streams and rivers that supply a larger body of water.
Not containing oxygen of not requiring oxygen
Complex interaction of food chains in a biological community.
Chemicals necessary for organisms to live
Decomposed or partly decomposed plant and animal matter
Rising tide
Free swimming aquatic organisms such as fish
The animal form of plankton
The place where a plant or animals live
Particles which accumulate on the bottom of a waterway