Final answer:
Canada geese and raccoons become overpopulated in urban areas due to abundant food sources like garbage, coupled with a lack of natural predators, and human alterations to the environment that increase its carrying capacity.
Step-by-step explanation:
Some wildlife species, like Canada geese and raccoons, become overpopulated in urban areas primarily due to two factors: the availability of resources and the lack of natural predators. In urban environments, these animals find plentiful food sources, such as garbage and food left by humans, allowing their populations to grow. Furthermore, the reduction of predators in cities means that these species have fewer threats to their survival, further contributing to their overpopulation. Additionally, humans altering their environment can increase its carrying capacity, sometimes to the detriment of other species, thereby allowing for an increase in the populations of species like geese and raccoons that can adapt to these conditions.