Rewrite each of the following statements in the form "∀ x, ." (a) All dinosaurs are extinct. ∀ ---Select--- x, ---Select--- . (b) Every real number is positive, negative, or zero. ∀ ---Select--- x, ---Select--- . (c) No irrational numbers are integers. ∀ ---Select--- x, ---Select--- . (d) No logicians are lazy. ∀ ---Select--- x, ---Select--- . (e) The number 2,147,581,953 is not equal to the square of any integer. ∀ ---Select--- x, ---Select--- . (f) The number −1 is not equal to the square of any real number. ∀ ---Select--- x, ---Select--- .