Some scientists gaze into outer space to look for answers. Some scientists seek answers in the depths of the sea. When George Steinhauser wanted answers, he looked within himself. Also, Austrian chemist spent three years researching the contents of his navel and the navels of others. He has solved one of life's greatest mysteries. We now know exactly what bellybutton lint contains. Steinhauser presented his findings in the online version of the journal Medical Hypotheses. The Vienna University scientist analyzed over 500 samples to determine the exact makeup of the lint.
If the underlined phrase is <em>a hot-tempered football player, </em>then the correct answer is D. an appositive phrase that describes another noun or pronoun in the sentence. The noun it describes is Roger.
