Science PSSA (Pennsylvania System of School Assessment) Prep Worksheet.Question #2 is directly from the 4th-grade PSSA released scoring sampler.The Worksheet asks students to look at 2 ecosystems (Forest and Playground System), and asks students to...identify living and non-living aspects of the ecosystemidentify why something in the ecosystem is non-livingworksheet also gives students the definition of a living thing at the bottom.Great for 3rd or 4th graders, in preparation for the Science PSS