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Topic: Vertebrate

Related Topics

Vertebrata

Chordata

Brain

Spinal column

Organogenesis

Amphioxus

Central nervous system

Tetrapoda

Bony fish

Notochord

Nervous system

Osteichthyes

Skeleton

Dipnoi

Acanthodii

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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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