why do you think the parts of the body have different sensitivities write a argument to support your explanation

They have different sensitivities possibly because it would hinder the host possibly, as they're used to varying degrees. As an example, people typically use their general arms and hands a lot and touch things while using them. If their arms and hands were as sensitive as their nipples or another highly sensitive body part, it could be distracting and also cause discomfort while trying to use your hands. If your fingertips weren't as sensitive, however, you might not be able to feel stuff as well. This causes problems as people can often use the sensitivity of their fingertips to do things, from finding something in the dark, to pick up a very small thing, to looking at for small dangers like pieces of glass. This shows that, on account of the different uses of different parts of the body, the sensitivity varying is important.