Biology

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Across
  1. 3. mouth directed downward
  2. 5. are lemurs, tarsiers, and lorises
  3. 6. Clams, oysters, scallops, and mussels
  4. 8. Dorsal supporting rod
  5. 11. Octopuses, squids, and nautiluses
  6. 12. out of water using pores and collar cell microvilli
  7. 15. are barnacles, shrimp, lobsters, crabs, crayfish, and pill bugs
  8. 16. internal organs
  9. 17. Oral sucker and at least one other sucker for attachment
  10. 20. brain, eyespots, and chemosensitive organs on the auricles
  11. 22. well-developed senses enable sharks and rays to detect prey
  12. 23. enable female to feed young without leaving them to find food
  13. 26. few setae per segment
  14. 32. repeating body units Well-developed nervous system
  15. 34. collects waste and excretes it through an opening in the body wall
  16. 35. various modifications
  17. 38. is free-swimming filter feeder with bilateral symmetry
  18. 39. To be a hominin, must have anatomy suitable for standing erect and walking on two feet
  19. 40. body cavity
  20. 42. are invertebrate chordates and found in shallow water and partially buried in sand
  21. 43. one pair of appendages per segment
  22. 44. no body cavity
  23. 46. fins supported by bony spikes
  24. 47. radial versus bilateral
  25. 48. Nudibranchs, conchs, and snails, and are Herbivores or carnivores
  26. 49. have many setae per segment
Down
  1. 1. jointed vertebrate limbs
  2. 2. are spiders, scorpions, ticks, mites, and harvestmen
  3. 4. envelopes but does not enclose visceral mass
  4. 7. generate internal heat
  5. 9. body cavity incompletely lined with mesoderm
  6. 10. leads to specialization
  7. 13. animal is organized circularly.
  8. 14. tonguelike with many teeth
  9. 18. provides insulation against heat loss
  10. 19. are monkeys, apes, and humans
  11. 21. spiders, scorpions, ticks, mites, and harvestmen
  12. 24. multicellularity
  13. 25. not all body parts change at the same rate.
  14. 27. body temperature matches the outside environment
  15. 28. body cavity completely lined with mesoderm
  16. 29. mouth directed upward from substrate
  17. 30. how many chambered heart (amphibians)
  18. 31. has brain and ventral nerve cord
  19. 33. study of insects adapted to active life on land
  20. 36. can be seen externally in rings encircling body of earthworm
  21. 37. two pairs of appendages per segment
  22. 39. animal has right and left halves.
  23. 41. Annelids concluded what
  24. 45. made of chitin, must be molted