Scientists compared the density of goblet cells in the lungs and the density of mucus in the lungs of three groups of people:
● people who do not smoke and do not have lung disease
● people who smoke tobacco but do not have lung disease
● people who smoke tobacco and have lung disease. The results are shown in the table.
What is indicated by these data?
1- There is a positive correlation (relationship) between density of goblet cells and density of mucus.
2- Lung disease results in an increase in goblet cell density.
3- There is an association between tobacco smoking and an increase in mucus density.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 and 3 only
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