The extremely popular IB Diploma Course Companion for Biology has been thoroughly revised, updated and extended. Still uniquely developed with the IB for the latest syllabus, the content has remained largely untouched, the main change being the improved page design to allow better access to the content. Option units have been more extensively revised and content is covered more rigorously. All of the features from the first edition have been retained - including the wider aims of the IB through connections to TOK, international-mindedness and the IB learner profile. Data-based question and ideas for practical experiments reinforce learning. Now in colour, more diagrams and photographs have been included to illustrate the concepts discussed and to place the subject in context. The CD material has been designed to enhance the book content. There are interactive multiple choice quizzes for each chapter to allow students to check their comprehension. Full answers to questions in the book are included, as are links to useful websites. 'Kitchen sink practicals' are optional exercises that do not always relate directly to the Diploma Programme. They can be done with equipment that can be found easily around the home or classroom and illustrate fascinating aspects of the biological world that will engage and inspire students.