Endangered animal Crossword puzzle

12345678910
Across
  1. 4. an animal environment
  2. 6. a group of the breed of animals
  3. 7. an animal species that no longer exist
  4. 8. Pollution is harming it
  5. 9. prevention of wasteful use of a resource
  6. 10. a low amount of an animal species
Down
  1. 1. Butterflies pesticides being found in food
  2. 2. being contaminated by pesticides
  3. 3. exposing harmful substances into nature
  4. 5. cutting down a large amount of trees