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

Growth band

Natural environment; Coral reefs

A band formed yearly on coral by the secretion of caco3; one yearly growth band contains two smaller bands representing winter growth and summer growth.

A developing embryo has spiral cleavage if, as it undergoes cleavage and changes from a four-cell embryo to an eight-cell embryo, the cells divide at slight angles to one another, so that the none of ...

Actinotroch

Natural environment; Coral reefs

A larval form found in the Phoronida (horseshoe worms).

Telolecithal

Natural environment; Coral reefs

An egg cell in which the yolk is not evenly distibuted throughout the cytoplasm, but is concentrated in one location, and cleavage is incomplete, e.g., a bird egg.