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Across
  1. 5. Entry of contaminants into the environment (9)
  2. 6. Major factor in biodiversity loss (12)
  3. 9. Fundamental building block of reality (10)
  4. 10. Crucial for communication and survival (8)
  5. 11. Variation within a species (14)
  6. 13. Study of materials at the nanoscale (10)
  7. 15. Provide new cells for the body (10)
  8. 16. Variety of life (11)
  9. 18. Basic unit of life (5)
  10. 19. Removal of forests for other uses (12)
Down
  1. 1. 14th-century invention leading to eBooks (13)
  2. 2. Unsustainable resource consumption (15)
  3. 3. Essential role in healthcare (16)
  4. 4. Facilitates rapid communication (12)
  5. 7. Method combining genes to form hybrid DNA (11)
  6. 8. Variety of ecosystems in a location (16)
  7. 12. Experimental gene-based disease treatment (11)
  8. 14. Advanced research on atoms and molecules (13)
  9. 17. Different species per unit area (14)
  10. 20. Organism numbers exceeding habitat capacity (13)