In this book you will find out about the organs, tissues, and cells that make up your body and what your body needs to keep it working properly.--Taken from back cover.

"Our world is incredibly diverse, but why are living things so different, and how do we make sense of the vast range of life forms? This book tackles the issues of variation - how and why it occurs - and classification, looking at how we organize plants and animals into groups." --Publisher's description.