Which type of research method attempts to answer the question, "why are they doing that? " (site 1)

The correct answer is qualitative research.

Explanation:

The qualitative research refers to a kind of research that aims to gain an understanding of the reasons, motivations, and opinions behind the subject or the concept being examined. This approach is utilized in various branches of study like in business, social sciences, market research, and even in the natural sciences.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.