Great article about what would happen if we got rid of all parasites. I think to middle school students, that might sound like a good idea. But this article, which is about the right reading level for middle school, explains the unintended consequences that could be expected. I think this would be excellent as a way to integrate authentic scientific articles into a unit on symbiotic relationships.
Start the school year off right with this FREE first chapter of The Earth Science Interactive Notebook series: Intro to Earth Science. The concepts in this chapter will introduce some key vocabulary and enable students to start understanding the different systems of Earth and all the branches of science that Earth Science entails. Each chapter in the series will showcase many activities for the students (both middle and high school) to process the information given by teachers.