No one has seen that island since, and you’d never read about those trees in any book. And yet, if I hadn’t found those shores I would have died, if I hadn’t discovered that tooth I would have been lost alone forever. what kind of sentence is this in elements of story

In storytelling, there are various kinds of elements. The basic elements are:

Of the five elements mentioned above, the one which speaks to the excerpt is Resolution.          

Explanation:

This refers to the description of how a problem is solved.

The excerpt is culled from "Life of Pi" by Yann Martel.

In this excerpt, Pi and the Tiger that has been his companion on a boat that had been lost on the sea many days. The island was discovered just at the point where he thought he and the tiger would die from hunger. They, however, somehow washed ashore on the strange island. The Island was bustling with life during the day but was a deadly place at night, capable of consuming flesh.

The place albeit dangerous provided meat, fish, algae and freshwater on which Pi and the Tiger survived on for days after they left it.

Hence the narrator's comment which is excerpted in the question.

Cheers

plagiarism can get you expelled from your course, and college, or university. plagiarism can result in legal action like fines and penalties etc.

maybe i could if you provided more information, such as a image of the text? (;