The main purpose of the last line of the passage is to signal the reader that steps will follow.
In the first part of the passage, the author is giving some <em>background information</em> about the topic, which functions as an introduction to develop the main topic. The last sentence serves <em>to trigger</em> what the passage is actually concerned in, that is, the different ways in which contamination by this bacterium can be avoided. Thus, what the reader is expecting after the last line are some steps to follow.
What story or book are we talking about here?
Answer:
A. Will live
Explanation:
Good job you got it right.
The sentence is talking in future tense. "Will live" is future tense.
While "are living" and "is living" are both present tense.
:)
The crust of the Earth is made of tectonic plates.
