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Coral colonies are composed of many tiny, cup-shaped animals called polyps. Polyps, which are related to jellyfish, can be as large as a saucer or smaller than the head of a pin. Millions of polyps working together eventually form the framework of coral reefs.

Are corals animal, vegetable or mineral? An introduction to the unique organism that is coral.

Environmentalism uses many terms that are unique to the science. This is a glossary of environmental terms. (A through E)

All living beings are composed of cells, but not all cells are alike. This article discusses the differences between plant and animal cells and the composition of plant cells.

All living beings are composed of cells, but not all cells are alike. This article discusses the differences between plant and animal cells and the composition of animal cells.