Passive transport and selective permeability. Passive transport through diffusion.
Watch the next lesson: https://www.khanacademy.org/science/biology/membranes-and-transport/passive-transport/v/facilitated-diffusion?utm_source=YT&utm_medium=Desc&utm_campaign=biology
Missed the previous lesson? https://www.khanacademy.org/science/biology/membranes-and-transport/diffusion-and-osmosis/v/diffusion-and-osmosis?utm_source=YT&utm_medium=Desc&utm_campaign=biology
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