Why does thoreau refer to civil disobedience as a duty?

Consider the title and souce of the following articles. which one is most likely to exhibit a bias? (a) how to roast beef," by the food editor of a magazine (b) americans experiencing greater fatigue than previous generations, " by a harvard researcher (c) "americans' worsening eyesight not related to computer screen usage," by the public relations director of a major computer manufacturer (d) "sharing the burden: a history of cooperation," by a college professor

One of the girls brought some candy for you. the prepositional phrase(s) is/are __

Which historical events have affected the meals you consume