This book aims to help students make a smooth transition from GCSE balanced science to A level biology. It meets the requirements of the new subject core and of all the major A level syllabuses, and has been written specifically for all students with a GCSE balanced science background. The book features: concise treatment of concepts in clear and friendly language; extension boxes to allow a deeper study of ideas; extensive question sections with answers at the back of the book; clearly structured sections with summaries of key concepts; and "context setters" at the start of each section to put the topic into its social, economic and technological framework. "Heinemann Advanced Science: Chemistry" and "Heinemann Advanced Science: Physics" are also available.