The New copy of this book will include any supplemental materials advertised. Please check the title of the book to determine if it should include any access cards, study guides, lab manuals, CDs, etc.
The Rental copy of this book is not guaranteed to include any supplemental materials. Typically, only the book itself is included. This is true even if the title states it includes any access cards, study guides, lab manuals, CDs, etc.
Deep underground and on the surface, worms are hard at work! Worms work like little plows, burrowing through soil by swallowing it. As they make their way through the dirt, worms loosen the soil so roots can spread and grow. Worms eat the bits of leaves and plants mixed with the dirt and leave behind castings that feed the plants. Find out how worms help us as they wiggle their way underground.