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Coral study reveals secrets of evolution

Corals first appeared on earth nearly half a billion years ago during the Cambrian Period of the Paleozoic Era. The ancient Greek philosopher Aristotle categorized corals as zoophyta, or "plant-animals", due to their plant-like appearance. Closer examination of corals revealed that they are not plants at all, but instead belong to a group of animals called cnidarians, which includes sea anemones and jelly fish.
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