My FAVOURITE textbook ever!
This is my favourite biology textbook by a mile. As a biology undergrad, I find that this book can be used across the vast majority of topics and modules. It provides a great amount of detail, it is easy to understand, engaging and supported mostly by illustrations and diagrams which make useful references in essays and other coursework. Although this is pricey, I would 100% recommend it and would not be without it. Sadava et al have covered biology beautifully in such a way that if you're ever struggling with a topic you will be able to refer to this book and it'll help you understand it. LOVE IT!