Why an electromagnetic wave can travel through empy space that contains no matter?

Me which theme is developed by the changing relationship between the narrator and his daughter in this excerpt ? as she grew older, she spent more of her time with girls. so much time indeed did she spend with them that she came no more, as she used to do, to her father’s room. i was scarcely on speaking terms with her. when mini and her father stop communicating, it develops the theme that children should not speak unless spoken to. as mini becomes more independent, it develops the theme that parents must learn to let go as their children grow up. as mini spends more time with friends, it develops the theme that young people are more influenced by peers than by parents. when mini and her father see each other far less often, it develops the theme that absence makes the heart grow fonder.

The significant structural shift that happens between chapters 21 and 22 is

Read the excerpt below and answer the question. nice town, y'know what i mean? nobody very remarkable ever come out of it, s'far as we know. the earliest tombstones in the cemetery up there on the mountain say 1670-1680-they're grovers and cartwrights and gibbses and herseys-same names as are around here now. in at least one hundred words, discuss the significance of the stage manager's narration in our town. analyze the text in terms of its tone, word choice, and meaning. what purpose does this narration serve in the play?