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External Websites
- Biology LibreTexts - The Levels of Classification
- National Center For Biotechnological Information - National Library of Medicine - PubMed Central - A Higher Level Classification of All Living Organisms
- University of Hawaii - Exploring Our Fluid Earth - Classification of Life
- Biology LibreTexts - Classification and Identification
- BBC - Bitesize - Classification and biodiversity
Britannica Websites
Articles from Britannica Encyclopedias for elementary and high school students.