Answer Happy

Please answer 7-9.
Arthropods "Reptiles" Mammals Sponges Jellyfish Insects Millipedes Crustaceans Mollusks Snakes Lizards Iguanas Crocodiles Whales — Chimpanzees Humans Birds Marsupials Amphibians Cows — Starfish Fish A feathers external skeleton placenta two fenestrae B hair- endothermy amniote digits jaws vertebrae protostome deuterostome nervous and vascular system organs с • A hypothetical common ancestor Answer the following 3 questions with reference to the tree above. 7. In a cladistic sense, "the lack of hair" is a(an): A) apomorphy B) pleisiomorphy C) sympleisiomorphy D) synapomorphy 8. In a cladistic sense, “the possession of an external skeleton" is a(an): A) apomorphy B) pleisiomorphy C) sympleisiomorphy D) synapomorphy 9. The artificial group “Arthropods + Reptiles” would be a A) monophyletic group B) paraphyletic group C) polyphyletic group D) none of the above