mother

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Across
  1. 2. a group of people living in a area
  2. 7. the south polar region
  3. 8. the physical world including plats, animals and landscape
  4. 12. vegetation
  5. 13. a biological community of interacting organisms and their physical environment
  6. 15. a hundredth of a whole
  7. 16. underrate
Down
  1. 1. oceans
  2. 3. the introduction of harmful substance into environment
  3. 4. small arthropod animals
  4. 5. lessen the strength
  5. 6. effect
  6. 9. take in, soak up
  7. 10. problems
  8. 11. the degree of heat present in an object
  9. 14. a hundred years