Written by Steve Potter and revised by a senior examiner, Martin Rowland, this AQA A2 Biology Student Unit Guide is the essential study companion for Unit 4: Populations and Environment.This full-colour book includes all you need to know to prepare for your unit exam: clear guidance on the content of the unit, with topic summaries, knowledge check questions and a quick-reference index examiner's advice throughout, so you will know what to expect in the exam and will be able to demonstrate the skills required exam-style questions, with graded student responses, so you can see clearly what is required to get a better grade