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

  2. Biology - Khan Academy

  3. Introduction to Biology

  4. Introduction to the Study of Biology - Biology LibreTexts

  5. Ch. 1 Introduction - Concepts of Biology - OpenStax

  6. Fundamentals of Biology - MIT OpenCourseWare

  7. Basics of Biology Study Guide - CK-12 Foundation

  8. Introductory Biology | Biology | MIT OpenCourseWare

  9. 1: Introduction to Biology - Biology LibreTexts

  10. Biology Basics: Key Concepts and Terminology Explained