Explain the distinction between implicit and explicit parametric polymorphism. What are their comparative advantages? What is duck typing? What is its connection to polymorphism? In what languages...

Explain the distinction between implicit and explicit parametric polymorphism. What are their comparative advantages? What is duck typing? What is its connection to polymorphism? In what languages does it appear? Explain the distinction between overloading and generics. Why is the former sometimes called ad hoc polymorphism?