Links:

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Biodiversity

1. IUCN (International Union for Conservation of Nature) — the global authority tracking species status and maintaining the Red List: https://www.iucn.org Wikipedia

2. WWF (World Wildlife Fund) — works in 100 countries on habitat and species conservation: https://www.worldwildlife.org

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Ocean Conservation
3. Oceana — the largest international advocacy group dedicated entirely to ocean conservation, focused on policy, science, and law: https://oceana.org
4. Ocean Wise Conservation Association — a global nonprofit marine conservation organization working through scientific research, education, and citizen science programs: https://ocean.org
5. Ocean Conservancy — known for the International Coastal Cleanup and marine debris research: https://oceanconservancy.org
6. Project AWARE — mobilizes divers to help with shark conservation and marine debris: https://www.projectaware.org

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Morphology (biological form/structure)
7. Society for Integrative and Comparative Biology (SICB) — hub for morphology and comparative anatomy research: https://sicb.org
8. Digital Morphology Library (DigiMorph, UT Austin) — a huge open archive of CT-scanned specimens showing internal/external anatomy: https://www.digimorph.org

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Diving Quick Tips
9. Divers Alert Network (DAN) — the leading authority on dive safety, medical advice, and emergency guidance: https://dan.org
10. PADI (Professional Association of Diving Instructors) — offers diving tips, certification info, and safety resources: https://www.padi.com