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A process or environment in which oxygen is involved or present.

A process or environment in which oxygen levels are totally depleted; an extreme form of Hypoxia.

Matter that settles to the bottom of a Liquid; dregs.

The use of either naturally occurring or deliberately introduced microorganisms to consume and break down environmental pollutants, in order to clean a polluted site.

Removing (a substance) from the surface of a Liquid.

The action or process of distributing or spreading things or organisms over a wide Area.

A system of observation and experimentation used to learn how the world works.