Three compounds are dissolved in a cream and applied liberally to the skin. The following plot shows the concentrations of each of these compounds in the blood following application of the cream. What can be concluded from the plot?
1) The concentration of all three compounds in the blood increases over time.
2) The concentration of one compound in the blood decreases over time, while the concentrations of the other two compounds increase.
3) The concentration of one compound in the blood increases over time, while the concentrations of the other two compounds decrease.
4) The concentration of all three compounds in the blood decreases over time.