Doing a Chemical and Physical Changes Lab edgenuity 2020 and I don't know what to put for Analysis and Conclusion?!? How to write analysis for chemical and physical change it was a bunch of different experiments to determine if chemical/physical i dont know how to summarize it help PLEASE

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.