You don't NEED legs. Cripples without legs have climbed Mt. Everest.
You don't NEED both arms. People have climbed The Nose without one hand.
You don't NEED both ears. People have done well without one ear.
If it's not vital, you don't need it. It's just a convenience.
Now, I'm not saying life would be wonderful without those, but you don't really need any of those.