private method default method final static field method declaration 16. How do we call a process of defining a method in a subclass that has the same signature and type as a method in its parent class? (answer in 1 word, small letters) (1 Point) 17. Collections. What is the name of the method we use to delete from the collection 1 all elements contained in the collection 2 (answer in 1 word, just the name of the method, ) (1 Point) 18. How do we call the ability of an object to take on different forms and to perform single task in different way? (one word, small letters, check spelling) (1 Point)