I believe that this role would be the facilitator. Hope this helps!
An appositive phrase consists of a group of words that renames or describes the noun beside or next to it. It serves as an additional information to the noun or pronoun it describes. Based on the given sentence above, the appositive phase is "an astronaut" and the noun that it renames or identifies is the word "father". Hope this answer helps.
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If authors continue to talk about global warming in their books, there is a chance readers might start to try preventing global warming. They might plant more trees after seeing what happened in books. Or they might stop using things that released bad fuel into the air which causes the air to become polluted and result in global warming. In conclusion, after seeing what might happen in books, readers might try to prevent that to creat a better environment and future.
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