A+ candy

This document summarises Unit 3 on Exchange fir the AQA specification of biology AS Level. It is tested in paper 1 of the specification and is one out of the 5 sections that are examined in paper 1. This document provides a brief summary with all of the key points and sometimes a few pneumonics to help remember key phrases and words. Originally written for the author's personal use, however it has now been adapted as much as possible for third party readers. May be slightly informal and witty a...