Biology

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