This Revision Guide (with free Online Edition) covers the Edexcel Level 1/Level 2 in Biology and the Edexcel International GCSE in Biology. It contains concise study notes for every topic, supported by clear diagrams, helpful tips for doing well in the Paper 1 and Paper 2 exams (material that's only needed for Paper 2 is clearly marked), and a section of detailed advice on Experimental Techniques. You can also read a free Online Edition of the whole book on a PC, Mac or tablet - just use the unique code printed in the book to access it.