Hydrogen, the most abundant element in the universe, is the main component of most stars and makes up more than 90 percent of mass in the universe. yet hydrogen is the smallest and lowest-mass of all the elements, consisting of only a single proton and single electron. what makes this passage an example of expository prose? a. it includes filler words and run-on sentences. b. it uses complex sentences and precise vocabulary. c. it expresses the author's feelings and emotions. d. it gives a general impression of the subject.