Which group of crustaceans has all of these attributes: - sessile, strongly attached to substrates with glue; cannot move from that spot - very hard plates around the body - adults without cephalization - captures food with feathery modified legs - internal direct fertilization A. polychaete tube worms B. echinoderms C. barnacles D. clams

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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.