5. which one of the following statements is true about p waves?
a. they travel only through solids
b. they travel faster than s waves
c. they are the most destructive type of waves
d. they cannot be recorded on the graph

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.