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primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought to be closely related to the ancestor of the first amphibians.
simple inorganic chemical substances (mineral salts) that are needed in relatively large amounts...
the active maintenance of the correct balance of water and solutes in the blood and tissue fluid...
can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms...
the introduction of harmful substances (pollutants) into the environment.