This resource will help you teach your middle school class how energy flows through an ecosystem using food webs and food chains They will compare and contrast food webs and food chains, and how this may result in bioaccumulation.
This resource includes:
Rubric and Guidelines for Small Group Assignment
3 page Energy Flow/Food Chain/Food Web Student
Bioaccumulation info sheet/student reproducible
This is a portion of my Interactions Within Ecosystems unit. You can check it out here --> http://www.teacherspayteachers.com/Product/Interactions-in-Ecosystem-Full-Unit-1403059