The answer that you are looking for is True.
Doing personal interviews with holiday shoppers at an indoor mall is an example of D. PRIMARY research.
A primary research is any type of research wherein the researcher personally goes out and collects data. The researcher can personally conduct surveys, interviews, observations, and ethnographic research. Results from these activities are gathered primarily by the researcher.
d. an opening specified for waste removal is present
The answer is A. They contain a large amount of gas and dust
So the flowchart should go like this:
Mutation in the CFTR gene >>>>>> Production of defective CFTR protein >>>>>> defective CFTR protein in cell membrane or no protein at all >>>>>>> Impaired ion transport across the cells >>>>>>> Cells secrete less chloride >>>>>>> leads to more re-absorption of sodium and water into the cells >>>>>>> decreased hydration of mucus present outside the cells as more water is absorbed into the cells >>>>>>>> thick viscous mucus.
