Environment

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Across
  1. 4. Determines the condition of life
  2. 7. They are part of the animal kingdom
  3. 9. They are essential for life
Down
  1. 1. They are complex creatures
  2. 2. An essential substance in life
  3. 3. Provides the necessary oxygen
  4. 5. It is the interaction of living beings
  5. 6. It sustains life on earth
  6. 8. They play a fundamental role