Coral reefs

Coral reefs

Coral reefs are structures formed from the calcium carbonate secretions of corals. They are colonies of tiny animals in marine areas containing few nutrients.

Industry: Natural environment

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Coral reefs

sonar

Natural environment; Coral reefs

SONAR is an acronym for "sound navigation and ranging." Active sonar describes an apparatus that transmits high frequency sound waves in water and registers the vibrations reflected back from an ...

paleobiogeography

Natural environment; Coral reefs

The distribution of organisms as revealed by the fossil record.

zenith

Natural environment; Coral reefs

The point of the celestial sphere which is directly overhead.

fin membrane

Natural environment; Coral reefs

The thin membrane between and connecting fin rays and spines of fishes.

The Kingdom of usually multicellular, heterotrophic eukaryotes that have multinucleated cells enclosed within cell walls. Nutrition is obtained by decomposing dead and dying organisms and absorbing ...

coevolution

Natural environment; Coral reefs

A change in the genetic composition of one species (or infraspecific group) in response to a genetic change in another, i.e. Two or more species evolving, each in response to the other.

purse seine

Natural environment; Coral reefs

A fishing net used to encircle surface schooling fish. During retrieval the bottom of the net is closed or pursed by drawing a purse line through a series of rings to prevent the fish from escaping. ...