Directions: Use the cladogram below to answer the questions on this worksheet. 1. What trait separates Lampreys from Tuna on this cladogram? 2. What separates a salamander from a turtle? 3. Which organism is most related to the leopard? share? A. B. C. Lancelet (outgroup) 4. What 4 traits do the leopard and the other organism from #3 have in common? D C Lamprey Tuna Salamander Turtle Jaws Leopard Vertebral column Hair Amniotic egg Four walking legs

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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.