Co-published with the IB to fully align with the new 2023 Biology Subject Guide for first assessments in 2025, with separate Standard Level and Higher Level print and digital student books to ensure that every student has the right content for their learning journey at the right time. New and updated material with familiar features, including the Nature of science, global applications, skills, TOK, key fact, and ‘Challenge yourself’ boxes that signpost and extend key learning points and contexts.