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Across
  1. 5. to discover or notice something
  2. 6. a system of living things and their environment
  3. 7. to react to something
  4. 9. to copy the behavior or appearance of something
  5. 11. animals living in nature
  6. 12. to let something go into the wild
  7. 14. to catch an animal or person
  8. 16. species animals or plants that harm a new environment
  9. 17. to bring something into a country
  10. 19. to move closer to something
  11. 21. a stable condition where things work well together
  12. 23. a danger or risk
  13. 24. a device that detects changes like heat or movement
  14. 25. a sign or message that gives information
  15. 26. the use of science to solve problems
  16. 27. to follow the movement of something
  17. 28. to keep something safe from harm
Down
  1. 1. a person who studies science
  2. 2. a way of doing something
  3. 3. to move and increase over an area
  4. 4. a very large snake found in tropical areas
  5. 7. looking like something real
  6. 8. animals animals living in nature, not kept by humans
  7. 10. a group of similar animals or plants
  8. 13. the natural world around us
  9. 15. a machine that can perform tasks automatically
  10. 18. the number of animals or people in an area
  11. 20. a device used to take pictures or videos
  12. 22. the protection of animals and the environment
  13. 25. an answer to a problem