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Fully updated for the current Biology for CCEA AS Level specification and endorsed by CCEA. It has been subject to a detailed quality assurance process by an independent Biology expert. It contains new colour-coded practical work sections to address the AS3 paper and provides sample examination questions for each topic. Illustrated in full colour with bright and clear presentation. The author, Dr James Napier, is a well-known Biology author who, prior to his recent retirement, was vice-principal in a Northern Ireland grammar school. Contents: AS 1 Molecules and Cells Chapter 1 Molecules Chapter 2 Enzymes Chapter 3 Cells Chapter 4 Cell Physiology Chapter 5 Continuity of Cells Chapter 6 Tissues and Organs AS 2 Organisms and Biodiversity Chapter 7 The Principals of Exchange and Transport Chapter 8 Transport in Plants and Transpiration Chapter 9 Circulatory Systems in Mammals Chapter 10 The Adaptation of Organisms Chapter 11 Biodiversity Chapter 12 Human Impact on Biodiversity