What scientific evidence does the author give to show
that people and dogs like each other?

there is no passage what do you mean?

give me the passage and i will answer your question

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)

assuming the underlined word is "regnant", the correct answer is b) ruling.