Higher Animal Traits

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Across
  1. 4. used for breathing by amphibians
  2. 8. producing your own body heat
  3. 9. trait of chordates, become gills or bones, muscles, and glands in animals with lungs
  4. 11. replaces the tissue in the fetal skeleton in all but agnatha and chondrichthyes
  5. 13. covering on mammals
  6. 14. flexible rod replaced by vertebrae in some animals
  7. 15. bony fish have this to regulate pressure internally
  8. 17. egg-laying mammals Echinda and Platypus
  9. 19. Use a placenta to feed young, born live
  10. 20. hook on top of the scale cuts down on friction in chondrichthyes
  11. 22. heart chambers in fish
Down
  1. 1. makes up Chondrichthyes skeleton
  2. 2. pouched mammals, koala, kangaroo, wombats, tasmanian devils
  3. 3. modified scales
  4. 5. animal gets heat from the environment sun, rocks, etc
  5. 6. shark tails, lobes 2 different sizes
  6. 7. heart chambers in amphibians
  7. 10. used on land for breathing by mammals, birds, and reptiles
  8. 12. used to breathe underwater, covered in bony fish exposed in cartilage fish
  9. 13. angelfish and bass tails, lobes same size
  10. 16. retains egg, young live off yolk and born live
  11. 18. heart chambers in crocs and gators, birds and mammals
  12. 21. lays eggs, amphibians, reptiles and birds a few mammals