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Photo Credits
- 1. (c) AJ Cann, some rights reserved (CC BY-NC-SA)
- 2. (c) Farhan Bokhari, some rights reserved (CC BY-NC-ND)
- 3. (c) Franco Folini, some rights reserved (CC BY)
- 4. (c) Greg Lasley, some rights reserved (CC BY-NC), uploaded by Greg Lasley
- 5. (c) Dan Mullen, some rights reserved (CC BY-NC-ND)
- 6. (c) MathKnight, some rights reserved (CC BY-SA)
- 7. (c) Marion Maclean, some rights reserved (CC BY-NC), uploaded by Marion Maclean
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- 9. (c) Celeste Ramsay, some rights reserved (CC BY-NC-ND)
- 10. (c) licensed media from BioImages DwCA without owner, some rights reserved (CC BY-NC-SA)
- 11. (c) mattmaves, some rights reserved (CC BY), uploaded by mattmaves
- 12. (c) Ferran Pestaña, some rights reserved (CC BY-NC)
- 13. (c) Wes, some rights reserved (CC BY-SA)
- 14. (c) Peter Prehn, some rights reserved (CC BY-NC-ND)
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- 17. (c) Jeffrey G. Cramer, some rights reserved (CC BY-NC), uploaded by Jeffrey G. Cramer
- 18. (c) Katja Schulz, some rights reserved (CC BY)
- 19. (c) Ferran Turmo Gort, some rights reserved (CC BY-NC-SA)
- 20. no rights reserved, uploaded by Scott Loarie