Biology 2e

Biology 2e is a comprehensive, peer-reviewed introductory college textbook released free under a Creative Commons licence by OpenStax at Rice University. It covers the chemistry of life, cell structure, genetics, evolution, biological diversity, plant and animal form and function, and ecology, all supported by clear diagrams and real-world examples. Because it is openly licensed, students and teachers can read, download and even adapt it at no cost. For Sri Lankan A-Level students and self-learners, it is a rigorous, up-to-date resource that rivals expensive commercial textbooks.