In this MARTHA SPEAKS interactive story students discover how plants and animals depend on each other in an ecosystem. Fallen leaves decay; earthworms eat the leaves and fertilize the dirt. Then trees use the fertilized soil to grow. When used as a part of Martha’s True Stories Buddies Program, buddy pairs engage with the interactive story and then talk and write as they draw a habitat they have seen that includes an ecosystem. To familiarize yourself with the program, begin by reading the Martha's True Stories Buddies Program: Overview.