Across
- 1. body cavity
- 3. tonguelike with many teeth
- 4. group that mostly consists of insects
- 5. protist which scientists believe animals evolved from
- 6. includes crocodiles, snakes, and lizards
- 10. Mammals whose young complete development in pouches
- 11. provides insulation against heat loss
- 14. includes frogs, toads, and salamanders
- 18. have cloaca like birds and lay hard-shelled amniote eggs
- 20. has both male and female sex organs
- 23. mouth directed downward
- 24. divide fluid-filled coelom
- 25. blastopore becomes anus
- 27. capture prey using a ring of tentacles that bear cnidocytes
- 28. free-living flatworms
- 29. body temperature matches the outside environment
- 31. consists of octopuses and squids
- 32. consists of gastropods, cephalopods, and bivalves
- 33. envelopes the visceral mass
- 34. includes clams, oysters, scallops, and mussels
- 36. body cavity incompletely lined with mesoderm
- 38. collects waste and excretes it through an opening in the body wall
- 40. most resemble the last single-celled ancestor of animals
- 43. segmented worm
- 44. primate group that includes lemurs
- 45. the study of insects
- 47. brain, eyespots, and chemosensitive organs on the front
- 49. another name for dorsal supporting rod
- 50. one pair of appendages per segment
Down
- 2. body is able to produce its own heat
- 4. no body cavity
- 7. mouth directed upward
- 8. larva bilaterally symmetrical and has four chordate characteristics
- 9. two pairs of appendages per segment
- 12. primate group that includes monkeys and humans
- 13. organized in right and left halves
- 15. used to attach to host
- 16. found in shallow waters, partially buried in sand
- 17. have many setae per segment
- 19. has a saclike body with many pores, and are aquatic
- 21. repeating body units
- 22. they have no setae and are fluid feeders
- 26. internal parasite
- 27. body cavity completely lined with mesoderm
- 30. muscular portion used for locomotion
- 35. process where larvae and adults have different lifestyles
- 37. have hair and mammary glands
- 39. blastopore becomes mouth
- 41. organized in a circle
- 42. have few setae per segment
- 46. supports internal organs
- 48. has to do with trees