In paragraph 2, the narrator mentions various annoyances, such as ringing in the ears, memories, or music that gets stuck in our heads. The author includes this information

To build tension

Explanation:

Hello. You did not enter the text to which this question refers, which makes it difficult to formulate a specific answer. However, when a narrator presents discomfort as mentioned in the question above, he is trying to show discomfort and disadvantages that he feels in relation to something and this creates tension in the plot, because the reader can perceive that the narrator will face difficulties that will leave the story more challenging.

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.

that is true because that is something they fulfill for their work.