Use the diagram below to answer the question.
Image
The diagram shows a beaker of water and molecules of red dye at the beginning of an experiment (Time 1) and the same beaker of water and molecules of red dye after 30 minutes (Time 2). Which of the following best explains what happened?
a
Molecules of water moved by active transport from a higher concentration to a lower concentration.
b
Molecules of red dye moved by active transport from a higher concentration to a lower concentration.
c
Molecules of red dye moved by diffusion from a higher concentration to a lower concentration.
d
Molecules of water moved by osmosis from a lower concentration to a higher concentration.
c
Molecules of red dye moved by diffusion from a higher concentration to a lower concentration.
Based on the provided information, the correct answer is:
c. Molecules of red dye moved by diffusion from a higher concentration to a lower concentration.
This is supported by the fact that the dye molecules initially had a higher concentration around the red dye drop, and it spread out over time, indicating the movement of the dye molecules from an area of higher concentration to an area of lower concentration.