Mammalia

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Across
  1. 4. vertebrae where ribs attach
  2. 5. vertebrae attached to the pelvis
  3. 6. mammals that give live birth after 3-4 weeks and emerge underedeveloped
  4. 8. clade containing rats, mice, and squirrels
  5. 12. single mandibular bone that forms the mammal jaw
  6. 13. first vertebrae responsible for nodding
  7. 14. second vertebrae responsible for side to side head movement
  8. 15. skeleton containing pectoral and pelvic girdles and the appendages
  9. 18. clade containing moles and shrews
  10. 20. clade containing monkeys and apes
  11. 22. the organ used for negative pressure breathing
  12. 24. clade containing ancestrally carnivorous organisms
  13. 25. the skull type seen in mammals
Down
  1. 1. carry blood away from the heart, typically oxygenated
  2. 2. neck vertebrae
  3. 3. egg laying mammals that lack teeth, placenta and nipples
  4. 7. mammals with a long gestation and placental nourishment
  5. 9. the circuit that goes between the heart and the rest of the body
  6. 10. clade containing bats
  7. 11. vertebrae that make up the tailbone
  8. 16. clade containing cetaceans and even-toes ungulates
  9. 17. carry blood towards the heart, typically deoxygenated
  10. 19. vertebrae below ribs
  11. 21. the circuit that goes between the heart and lungs
  12. 23. skeleton containing skull, vertebrae, ribs and sternum