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Invertebrate Anatomy refers to the study of the internal and external structures of animals that lack a backbone, encompassing various phyla such as Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Mollusca, Arthropoda, Echinodermata, and others. This field explores the diverse forms and functions of invertebrate organ systems, including nervous, circulatory, respiratory, digestive, excretory, reproductive, and locomotor systems, as well as their developmental processes and evolutionary relationships. It also investigates the unique adaptations of fossil invertebrates and their ecological roles in past and present ecosystems. Overall, Invertebrate Anatomy provides insights into the incredible diversity and complexity of animal life beyond vertebrates, shedding light on the fundamental principles of biological organization and evolution.