Food chain

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Across
  1. 5. an environment made of many types of people or things
  2. 7. to describe a very bad or serious problem
  3. 9. the kinds of food that a person usually eats
  4. 10. to understand the facts of the situation
  5. 11. to make a guess about a size or number
  6. 13. to have babies
  7. 15. to have an impact or influence on something
  8. 17. becoming less
Down
  1. 1. someone who works to protect environment
  2. 2. to gather food from the fields or the sea
  3. 3. an animal that kills and eats other animals
  4. 4. something for sure and without doubt
  5. 6. to give something a lot of time and money
  6. 8. to bring something back to its original condition
  7. 12. a single person
  8. 14. be related to making money
  9. 16. very important