This textbook provides both, depth of content and opportunities for skill development that aligns with the latest version of the IB DP Biology Guide. It presents a clear and logical learning model that can be followed by all teachers, independently of their expertise teaching the IB Biology program, and students. They will also find the section that introduces Tools and Inquiry extremely useful. Marcela Rodriguez, Specialist in Science Education and senior examiner with 25 years teaching international Biology programs in bilingual schools in Buenos Aires, Argentina. -- Marcela Rodriguez, Specialist in Science Education and senior examiner * Marcela Rodriguez, Specialist in Science Education and senior examiner *