none compresive What is the sequence of the important major steps in the evolution of the animal kingdom? (consider symmetry, number of tissue Ave Bach layers, cephalization, development of coelom, and embryo development that led to the major phylogenic divisions within the go Biology 151 lab kingdom) 1. Example phyla (list 2. if more than 1 exists) 2. Tissues Present? 6. Acoelom? Coelom? Pseudocoelom? Does not apply? 3. #tissue Layers? hone 4. Type of Symmetry? assymetry 5. Cephalization Present? THE EMBRYO 7. #tissue layers In embryo 8. Spiral or radial Cleavage in embryo 9. Gastrulation Porifera Mouth or anus Forms first Sponge None Diploblasts Triploblasts Protostomes Deuterostomes

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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.