With the forest as an example, Sam and Zoe talk about the components biotic and abiotic of an ecosystem. They also discuss the role of producers, consumers, and decomposers. This concise clip covers all of the basics. As an introduction...

In this ecology vocabulary exercise:  wetlands activity, students read the definitions of 8 words, then categorize a species found in a wetland in their region.  This page has numerous links to helpful web resources.