Answered

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Read the paragraph from “Why Some People Catch a Cold and Others Don’t.”

To better understand why some people get sick from cold viruses while others escape illness, the researchers examined airway cells from healthy human donors. The cells were obtained from the lining of people’s nasal passages or of their lungs.

What is the most likely reason the author included this paragraph?

Why Some People Catch a Cold and Others Don’t

ANSWERS

A to explain the procedure of the study
B to compare healthy lung cells to lung cells under stress
C to show the difference between nasal-passage cells and lung cells
D to further explain what the respiratory system is