0The food chain is an incredible and delicate system that shows the flow of energy throughout an ecosystem. This title explains what energy is, how it is used, and what decomposers are and how they are an extremely important part of it all. The book is complete with colorful photographs and clear and informative text. Aligned to Common Core Standards and correlated to state standards. Abdo Kids Jumbo is an imprint of Abdo Kids, a division of ABDO.