Which of the following choices best explains why the author cannot say for certain how romantic love affects levels of serotonin in the brain? Answer choices for the above question A. There has not been a purely neurological study examining the relationship between the two. B. Some evidence suggests that romantic love increases serotonin and other evidence suggests it decreases serotonin. C. Serotonin does not have strong effects on the brain compared to dopamine and norepinephrine. D. There is a possibility that study subjects were not actually in love, but rather just suffering from obsessive-compulsive disorder.

Which line from the splendor falls on castle walls contrasts most sharply with the repeated phrase "dying, dying, dying"?

Read the excerpt from martin luther king jr.’s "i have a dream” speech. and so let freedom ring from the prodigious hilltops of new hampshire. let freedom ring from the mighty mountains of new york. let freedom ring from the heightening alleghenies of pennsylvania. let freedom ring from the snow-capped rockies of colorado. let freedom ring from the curvaceous slopes of california. but not only that: let freedom ring from stone mountain of georgia. let freedom ring from lookout mountain of tennessee. let freedom ring from every hill and molehill of mississippi. from every mountainside, let freedom ring. the most likely reason king uses allusions in this part of his speech is to share his knowledge of american geography. compare northern and southern destinations. remind listeners about small-town accountability. encourage listeners to envision freedom everywhere.

Choose the sentence with the correct subject-verb and pronoun-antecedent agreement. a. martha spend her days gossiping with everyone who walks by. b. each of the ushers in the wedding had to wear his rented tuxedo. c. the marching band don't raise enough money for its trip to the rose bowl parade. d. neither my sister nor i was happy when her had to move last year.