Answer:
Facilitated Transport.
Explanation: In facilitated transport, also called facilitated diffusion, materials diffuse across the plasma membrane with the help of membrane proteins. Hopefully this helps!
In a free market system, price controls can include both floors and ceilings.
The government imposes these limitations in order to regulate the retail value of specific goods and services. Rather than have limits on both sides, most items have either a floor or a ceiling imposed on them.
