Science Crossword Puzzle

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Across
  1. 3. Group to which Octopuses and snails belong
  2. 4. Fish without bones
  3. 7. Likes to chase mice
  4. 9. Animals that eat both plant and animals
  5. 11. Group to which earthworms and leaches belong
  6. 13. Plant food production process
  7. 14. Animals with backbone
  8. 21. Animals that eat plants
  9. 22. Dioxide, Gas used to make plant food
  10. 24. Animals with fins, scales and gills
  11. 25. Plant without roots
  12. 28. Animals that produce milk for their young
  13. 29. Period of inactivity for some animals during winter
  14. 30. Man's best friend
  15. 31. Animals with 8 legs and 2 segment bodies
  16. 32. Animals that eat meat
  17. 33. Male plant part
Down
  1. 1. Has a trunk
  2. 2. Large marsupial
  3. 5. Help to keep a plant in place
  4. 6. Female plant part
  5. 8. Cold blooded animal
  6. 10. Attracts insects
  7. 12. Animals with 6 leg and 3 segment bodies
  8. 15. Group to which starfish and sea urchins belong
  9. 16. Animals that begins life in water but later live on land
  10. 17. Can generate new plant
  11. 18. Animals with feathers, wings and beak
  12. 19. Group to which crabs, lobster and shrimp belong
  13. 20. Part of a plant that makes food
  14. 23. Flying mammal
  15. 26. Gas released by plants
  16. 27. Animals without backbone