B2

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Across
  1. 5. Reproductive structure
  2. 6. Control center organ
  3. 8. Six-legged arthropod
  4. 9. Body covering filament
  5. 10. Circulatory fluid
  6. 12. Organ of sight
  7. 14. Mature organism
  8. 17. Food intake opening
  9. 18. Legless invertebrate
  10. 19. Pumping organ
Down
  1. 1. Young organism
  2. 2. Smell organ
  3. 3. Cold-blooded vertebrate
  4. 4. Aquatic vertebrate
  5. 7. Feathered vertebrate
  6. 11. End of life
  7. 13. Organ of hearing
  8. 15. Breathing organ
  9. 16. Chewing structure
  10. 17. Warm-blooded vertebrate