Explaining concepts and academic vocabulary

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Across
  1. 3. invasive species
  2. 4. socio-economic ladder
  3. 6. photosynthesis
  4. 9. GDP
  5. 10. persistence
  6. 11. frequnecy
Down
  1. 1. self-esteem
  2. 2. genetic disorder
  3. 4. stagnation
  4. 5. condensation
  5. 7. telesurgery
  6. 8. hypothermia