Which source would be the most credible choice for researching tornadoes in the united states?

a photo-sharing site containing personal pictures of tornadoes

a file-sharing site containing fictional stories about tornadoes

a personal blog

a government agency’s weather website

 D) a government agency’s weather website.

Explanation: When researching a topic, we need to be careful with the sources that we use. According to the topic that we are researching, we need to find the most reliable sources, because in this way, we can be sure that the information that we obtain, is correct and trust worthy. If we are looking for information about tornadoes in the United States, the most credible source would be a government agency's weather website.

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

since he could see color, and nobody else could, he didn't find it fair that everyone else in the utopia couldn't see color but him and the giver : d