why there are more joints un the hand & feet than in the other parts of the body?

Answer 1

actually there are more joints in the hand & feet that we can voluntarily control(e.g can we move our rib joints like our fingers?).The reason is the fine and skillfull movements that we need to do with our hands and feet.Think of wearing a shirt/writing a letter/kick a ball if you are permitted only to flex & extend your fingers and feet!

Answer 2

because there are more appendages (all your fingers and thumb, plus your wrist)

Answer 3

because you need them. ?????