Written by a senior examiner, Ed Lees, this Edexcel AS/A2 Biology Student Unit Guide is the essential study companion for Units 3 and 6: Practical Biology and Research and Investigative Skills.This full-colour book includes all you need to know to prepare for your Unit 3 and Unit 6 assessments: - clear guidance on the range of practical apparatus and techniques that you need to know about and an overview of the scientific method of testing ideas by experimentation - examiner's advice throughout, so you will know what to expect in the assessments and will be able to demonstrate the skills required - sample investigation tasks for extra practice before your assessments