Organisms are placed in taxonomic classifications based on differences and similarities of their traits. If you know what critical traits to look for, it is possible to separate any animal into a taxonomic category using a dichotomous key.

The common taxonomic categories are Domain, Kingdom, Phylum, Class, Order, Family, Genus and Species (Specific Epithet.) We are looking at the Phylum and Class categories in this assignment.
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For help on how to use the Dichotomous Key, download and review the document called How to use the Dichotomous Key.
Save a copy of the table with your name in the file name.

Part 2: Answer the following questions as they relate to the nine phyla in the assignment table. (Porifera, Cnidaria, Nematoda, Athropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.)

Which phyla lack organs? What type of symmetry do they have?
List all of the phyla that show cephalization.
Do all organisms on the table have 3 germ layers (endoderm, ectoderm, and mesoderm)? If not, which phyla have fewer than three germ layers?
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.
Fish do not all have the same skeletal structure. Describe the differences among fish skeletal structures from the most primitive to more advanced types of fish.
Describe the three types of mammals based on how their young develop.

 
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