Examine the diversity and evolution of multicellular invertebrate animals, with emphasis on common themes in animal body construction and function. Three lecture hours and three laboratory hours a week for one semester. Biology 448L and Integrative Biology 448L may not both be counted. Prerequisite: The following with a grade of at least C-: Biology 325 or 325H, and Biology 206L, Integrative Biology 208L (or Biology 208L), Molecular Biosciences 226L (or Biology 226L), or Environmental Science 311.