Pls explain defining and non defining relative clauses​

Which of the following group roles has the responsibility of keeping the discussion on schedule?

Which revision of this sentence best uses direct characterization?

1which is an example of a claim? a . . never give up on a goal or dream just because someone tells you it’s impossible. b people said no one could scale mount everest, but in 1953, sir edmund hilary and tenzing norgay gazed down upon the world from its summit. c a rude remark is like a piece of litter in a national park—the best thing to do is throw it in the garbage where it belongs. d 1903, orville and wilbur wright made the first sustained powered flight in a heavier-than-air machine. review the sentence. actually, we the chair in spain about 20 years ago. 2 which correctly completes the sentence? actually, we the chair in spain about 20 years ago. buy buyed bought boughten