Charlie’s crossword puzzle

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Across
  1. 4. an extremely cold biome full of animals requiring adaptations for the cold
  2. 9. a lush biome full of living and non living things
  3. 12. an expert in studying living things relate to their environment
  4. 14. an open biome almost empty however, full of living animals and plants
  5. 15. a change in the body to help the plant/animal survive
  6. 18. plants do this to make their own food and oxygen
  7. 19. something that is required for something to live
  8. 20. the arrangement of and relations between the parts or elements of something complex
Down
  1. 1. all of the living organisms in the area
  2. 2. Light produced that every living thing in the world requires to live
  3. 3. invisible gas surrounding the earth
  4. 5. a biome full of sea creatures and non living things
  5. 6. this state has lush forests and its name starts with a Q
  6. 7. living organisms (usually plants or animals)
  7. 8. something used to help stop any predators from hurting the living thing
  8. 10. a community full of non living and living things
  9. 11. an individual animal, plant, or single-celled life form
  10. 13. the natural home of a plant/animal
  11. 16. a wet liquid substance that every living thing requires to live
  12. 17. a plain biome with little living objects