Use the dichotomous key to identify the organism below. DINOSAUR DICHOTOMOUS KEY go to step go to step 1. Walks on 4 legs Walks on 2 legs. Has a long neck Has a short neck go to step go to step 2. go to step 9 go to step 10 3. Mouth is open Mouth is closed Body is 2 colors Body is 1 color. Apatosaurus Brontosaurus 4. Nose horn absent. Nose horn present.. go to step 6 go to step 7 5. Spikes only on top ridge of back.. Spikes are ali over back.. Stegosaurus go to step 8 6. Feather-like protrusions on skull One horn on top of skull 7. Styracosaurus Centrosaurus 8. Tall club is shaped lke a circie I club is shaped like a heart Ankylosaurus Crichtonsaurus Spikes on head.. No spikes on head 9. go to step 11 go to step 12 10. Large fan-shaped bones on back Wuerhosaurus No fan-shaped bones on back go to step 13 11. Teeth are visible Tyrannotitan Camotaurus Teeth are not visible 12. Toes are visible Toes are not visible. Tyrannosaurus Rex Spinosaurus 13. Spotted pattern on back.. go to step 14 go to step 1s No pattem on back 14. Back of skullis elongated Skull is regularty shaped Parasaurolophus AbrictosaurUS 15. Entire body is one color. Belly is ighter than the rest of body Velociraptor Suchomimus

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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.