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  1. Introductory and General Biology - Biology LibreTexts

  2. General Biology - Open Textbook Library

  3. General Biology 1e (OpenStax) - Biology LibreTexts

  4. Biology | Definition, History, Concepts, Branches, & Facts | Britannica

  5. Introduction to the Study of Biology - Biology LibreTexts

  6. Biology - Wikipedia

  7. Introductory Biology | Biology | MIT OpenCourseWare

  8. Fundamentals of Biology - MIT OpenCourseWare

  9. General Biology I: Survey of Cellular Biology - Open Textbook …

  10. Concepts of Biology - Open Textbook Library