Which statement about signal phrases is true?

signal phrases should be worded the same way throughout an informational text.
signal phrases are only needed when a writer uses a direct quote from an article.
signal phrases should provide just enough information to show the reader that the source is a valid one that can be trusted.
signal phrases should provide name, job, and source of every fact used in a text.

Can someone explain this to me clearly plz

Why does the author's description of the mercury boiler—"the mercury, when vaporized, going into a mercury turbine and then into a condenser, remaining hot enough to generate steam in a steam boiler"—intentionally incorporate such highly technical language? using technical language establishes the expertise of the writer and convey the complex nature of the process being described. using technical language allows the writer to subtly poke fun at those who seek to make basic processes seem overly complicated. using technical language encourages readers to develop deeper and more meaningful personal connections to the information. using technical language lets the writer make clear to readers that the article is intended for readers who are themselves experts on electricity.

What are some man vs. nature conflicts in the outsiders by s. e. hinton?