Which of the following is a sentence fragment? a. knowing he would be late, she took a nap. b. realizing you are getting older is sobering. c. checking his mail each day was always fun. d. hiding in the tree fort he had built as a kid.

An effective thesis statement will reflect . . 1) possible weaknesses in your own argument. 2) possible weaknesses in your opponent's argument. 3) the type of document--or genre--you plan to write. 4) your attitudes about aquatic mammals