Biology Crossword

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Across
  1. 2. group of vertebrates that include snakes and lizards
  2. 5. cold-blooded vertebrates
  3. 6. eating food and using it for metabolism and growth
  4. 7. group of animals without backbone
  5. 9. a group of warm-blooded vertebrates
  6. 11. the act of breathing
  7. 12. category of living organisms
Down
  1. 1. changes in animals over time, dicovered by Darwin
  2. 3. group of animals that share the same characteristics
  3. 4. microorganism that can cause illness
  4. 8. a characteristic of an organism, often caused by genes
  5. 10. a vertebrate with gills