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Also called decompression sickness, this results when bubbles from Dissolved gases form in the blood or in tissues because of rapidly decreasing Pressure.

The variety of plant and animal life in the world or in a particular Habitat, a high level of which is usually considered to be important and desirable.

The natural home or environment of an animal, plant, or other organism.

A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The Species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g. Homo sapiens.

A Current score or amount.

Taking a sample or samples of (something) for analysis.

Plankton consisting of small animals and the immature stages of larger animals.

Plankton consisting of microscopic plants.

A single-celled alga which has a cell wall of silica. Many kinds are planktonic, and extensive fossil deposits have been found.

A small or microscopic aquatic crustacean of the large class Copepoda.