This 'Unit 3 - ORGANISMS EXCHANGE SUBSTANCES WITH THEIR ENVIRONMENT' revision resource has been made specifically for current or prospective AQA A-Level Biology students. It covers all topics within unit 3 of the AQA specification. The content is 100% hand-drawn and written by me, containing all details from the AQA guidelines plus more. These meticulous notes provide an in-depth understanding of the content, allowing you to achieve maximum success in your classes, coursework and exams. With easy-to-understand diagrams and comprehensive explanations, I guarantee this resource will leave you feeling confident and well-prepared.