How does each characteristic benefit primates?

Please provide me with a list of primate characteristics that you'd like me to explain the benefits of. For example, you could ask:

"How does each of these primate characteristics benefit them:

* Five-fingered hand

* Opposable thumbs

* Prehensile tail

* Binocular vision

* Large brain size"

Once you provide the characteristics, I can explain how each one contributes to their survival and success.