In this book, you'll learn why some plants have wood and bark and why some don't, how the vascular cambium and cork cambium form, what cells are present in wood and bark, the difference between springwood and summerwood, the difference between heartwood and sapwood, the function of lenticels, and how knots form. In the back of this book, the activity with an adult will show you how to track the growth of a woody branch from season to season. The two-page glossary has definitions and IPA pronunciation guides for new terminology so you can feel confident when reading this book!