This PowerPoint contains information about food chains and webs. It will define and give many examples of the following:
order of the food chain
Types of food chains
Harmful things to a food chain
Caring for ecosystems
There is a study guide that follows this PowerPoint and a test that can be purchased separately. The PowerPoint, "Relationships in an Ecosystem" also goes along with the study guide and test. Both PowerPoints, study guide, and test usually takes a week.