Facts101 is your complete guide to Biology, A Guide to the Natural World. In this book, you will learn topics such as Life's Home: The Cell, Life's Border: The Plasma Membrane, Life's Mainspring: An Introduction to Energy, and Vital Harvest: Deriving Energy from Food plus much more. With key features such as key terms, people and places, Facts101 gives you all the information you need to prepare for your next exam. Our practice tests are specific to the textbook and we have designed tools to make the most of your limited study time.