Introduces the morphology, anatomy, physiology, adaptations, evolution, life history, and systematics of the major groups of invertebrate animals. Major trends in invertebrate evolution will be used to illustrate the constraints upon adaptive selection. Theories about the form and function of animals will be examined. Intended for majors in Biology. Counts as a Biology major elective. Mandatory, multiday, overnight, weekend field trips required. Field trips will entail additional student costs. Two hours lecture and three hours laboratory per week. Prerequisite: BIOLOGY 115 (Concepts in Biology 2). Not offered every semester.