The phyla we viewed today were the porifera, the cnidaria, the nematoda and the arthropoda 1. Which phyla exhibited bilateral symmetry? 2. Which phyla had no true tissues? 3. Which phyla contained parasitic organisms? 4. Which phyla were coelomates? 5. Which phyla exhibited cephaliziation? 6. Which phyla that you viewed today contained specialized appendages? 7. Which phyla exhibited radial symmetry? 8. Which phyla were pseudocoelomates? 9. Which phyla had a complete digestive system? 10. Which phyla were multicellular? 11. Which phyla were asymmetrical? 12. Which phyla were acoelomates?

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Q: part i How many of the following are characteristics of arthropods? 1. protostome development…

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A: Step 1:     Step 2: Step 3: Step 4:

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Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.