extra credit part 1

extra credit part 1 - ZO 150 Lab Extra Credit Assignment...

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ZO 150 Lab Extra Credit Assignment Phylum Chordata Phylum Chordata has 4 defining characteristics; the dorsal-hollow nerve cord, the notochord, the pharyngeal slits, and a post-anal tail. The notochord is a tough, flexible but non-elastic rod that lies directly beneath the dorsal-hollow nerve cord. The notochord is the evolutionary source of the vertebrae. The pharyngeal slits and bars functioned as a filter–feeding system in the ancestral chordates. The post-anal tail is sometimes seen as being used to add power in locomotion with a caudal fin. This Phylum’s defining characteristics are seen throughout many different stages in the lifecycle. In some chordates the life cycle is so drastic that they change their environment as well as their bodies. This is very evident in amphibians, which start their life in the water as tadpoles and then move on to dry land as adults. This phylum can be found in almost all environments including freshwater, marine, terrestrial, and in the air. Behavior in the chordates is very versatile considering
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This note was uploaded on 03/26/2008 for the course ZO 150 taught by Professor Grant during the Fall '07 term at N.C. State.

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extra credit part 1 - ZO 150 Lab Extra Credit Assignment...

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