The weed known as Mile-a-Minute is now growing in the area. This vine is physically damaging the shrubs by growing over them. These weeds are also blocking the sunlight for the shrubs. The shrubs are beginning to die. Identify one biotic factor and one abiotic factor that are causing the shrubs to die. Predict what effect this will have on insects living on the shrub and birds that eat the weed in the ecosystem.