Answer:
Passive transport is the movement of particulars across the membrane from area of high to an area of low concentration.
Step-by-step explanation:
Passive transport is a transmembrane cellular transport mechanism characterized by the fact that it does not require energy.
What enables passive transport is the concentration gradient of a particle, which moves across the membrane from a site of high concentration to a site of low concentration.
Two known forms of passive transport are simple diffusion and facilitated diffusion.