Check even if the feature can be observed in just some species! Type of Mollusk Cephalopods Characteristic Gastropods Bivalves 1. Intelligent, well developed nervous system 2. Has no distinct head 3. Has an open circulatory system 4. External shells present in some spécies 5. Bite prey with beak 6. Uses gills for both respiration and food collection 7. All species are carnivorous predators 8. Uses a radula for feeding 9. Can change color for camoflauge

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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.