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SCIE206-1102B-13 Biology 5 - There are jawed fish and...

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Maurice A. Tillman 11 July 2011 1. Which phyla lack organs? What type of symmetry do they have? Porifera and the Cnidaria, The Porifera lack symmetry in their body plan. The Cnidaria have a radial symmetry. 2. List all of the phyla that show cephalization. Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda and Chordata 3. Do all organisms on the table have 3 germ layers (endoderm, ectoderm, and mesoderm)? No. If not, which phyla have fewer than three germ layers? Porifera, Cnidaria 4. One phylum on the table has more species than all the others. State the name of this phylum, and provide several different examples of species found in this phylum. Arthropoda (scorpions, crabs, beetles, ect.) 5. Fish do not all have the same skeletal structure. Describe the differences among fish from the most primitive to more advanced types of fish.
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Unformatted text preview: There are jawed fish and non-jawed fish. The jawed fish is considered higher on the evolutionary chain because jaws add better resperation and biting force. 6. Describe the three types of mammals based on how their young develop. These types are the monotremes (hedgehogs), the marsupials (kangaroos) and the placentals (people). The monotremes lay eggs, marsupials give birth to immature young and develop them in a pouch, and placental mammals give birth to live young. References: Author unkown (2009) San Diego Zoo, “Animal Bytes – Mammals” www.sandiegozoo.org/animalbytes/a-mammal .html Author unkown (2011) “Gallery of Pennsylvania Fishes”, Penn. Fish and Boat Commission http://www.fish.state.pa.us/images/copyright.gif All other reference come from AIU coursework....
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