science words

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Across
  1. 1. threat
  2. 3. weak
  3. 5. study of ecosystems
  4. 6. a single path of energy
  5. 7. dependence on aniamls
  6. 8. where an animal lives
Down
  1. 2. categories
  2. 4. dependence on area
  3. 5. type of area
  4. 6. linked