How does a persuasive essay differ from an expository essay

Which two lines in this excerpt from leo tolstoy's the death of ivan ilyich together use symbolism to indicate that death is approaching?

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.

Based on the excerpt, what is a reader most likely to infer about the toads? there are only a few toads. there are many toads. the toads are inside the car. the toads are dying.