What are the key differences between Boston ivy and poison ivy in terms of appearance, growth habits, and potential risks to humans?

Boston ivy and poison ivy are both climbing plants, but they have key differences in appearance, growth habits, and risks to humans. Boston ivy has three-lobed leaves that turn red in the fall, while poison ivy has three shiny leaflets that can cause a rash when touched. Boston ivy is a harmless plant that adds aesthetic value to buildings, while poison ivy can cause skin irritation and allergic reactions in humans. It is important to be able to distinguish between the two to avoid potential health risks.