They make the air cleaner. This book is a workbook. It is all yours. You can write your name in this book at the bottom of this page. 4-H'ers can use the fair project ideas at the end of each chapter.
School children can use the project ideas for science fairs.
You see a tree from your view. They help an animal or plant grow. You can't see them, but they are important. Roots also help hold a tree in place. The trunk helps water and nutrients get to the rest of the tree.