Disease is a bad condition in specific organs or body parts caused by harmful microorganisms such as bacteria, viruses, wounds, chemical imbalances in the body, exposure to toxins, and the appearance of imperfect cells. ...

The area around Riau University has a lot of leaf litter because the area is overgrown with trees, but currently the destruction of leaf litter scattered only done by burning. This is because there is no leaf garbage tub ...