"Amphioxi are small marine animals found widely in the coastal waters of the warmer parts of the world and less commonly in temperate waters. Both morphological and molecular evidence show them to be close relatives of the vertebrates." - http://www.britannica.com/EBchecked/topic/21580/amphioxusThe Amphioxus is important to scientists because of its possible link to all modern vertebrates. These links are used to support the evolution theory that all organisms are decedents of one common ancestor.
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