Written by a senior examiner, Mary Jones, this Edexcel A2 Biology Student Unit Guide is the essential study companion for Unit 4: The Natural Environment and Species Survival.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