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Topic: Vertebrate

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 Vertebrate - MSN Encarta
Vertebrates make up only about 2 percent of the animal species, and they belong to just 1 of more than 30 phyla, or overall groups, in the animal kingdom.
The only vertebrates that do not have this kind of skeleton are cartilaginous fish, a group that includes sharks, skates, and rays.
A vertebrate's spinal column is held together by strong ligaments, but the faces of adjoining vertebrae are separated by elastic pads called intervertebral disks.
encarta.msn.com /encyclopedia_761558106/Vertebrate.html   (854 words)

 Vertebrate Encyclopedia @ AlienArtifacts.com (Alien Artifacts)   (Site not responding. Last check: 2007-10-21)
Vertebrates started to evolve about 530 million years ago during the Cambrian explosion, which is part of the Cambrian period (first known vertebrate is Myllokunmingia).
Defining characteristics of a vertebrate are a backbone or spinal cord, a brain case, and an internal skeleton.
In higher vertebrates the size of the brain relative to the size of the body is greater.
www.alienartifacts.com /encyclopedia/Vertebrate   (595 words)

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