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 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 examiner's advice throughout, so you will know what to expect in the assessments and will be able to demonstrate the skills sample investigation tasks for extra practice before your assessments.