This text is suitable for mixed ability sets or streamed sets, where students will be entered for either Lower or Higher Tier at biology GCSE. H arder topics that are exclusive to the Higher Tier (Grades A*-B) are clearly marked. The series aims to raise the achievement of border-line candidates to help them achieve more at GCSE. Single and Double Science can be taught as both options are clearly marked. This textbook is designed to be accessible to all students with extra support provided in separate support packs for teachers. Key Concepts are easy to access in the text and important facts are summarized at the end of each chapter. It contains a comprehensive range of optional experiments and investigations within the text, with additional guidance to help students understand the results of their work. Additional support for ICT is included. Full coverage of the Key Skills requirements is covered. It has a range of support for Ideas and Evidence in Science.