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It is called diffusion.
it means there is a lot of people in an area like maybe on black Friday the stores where crowded
Diffusion
Slums
Crest, and the least dense the Trough
active transportation is the movement of molecules from a less crowded area to a more crowded area. passive transportation is the movement of molecules from a more crowded area to a less crowned area.
It requires energy.
Big balls> oo
It requires energy.
It requires energy.
It requires energy.
an area of a city that was poor, dangerous, and crowded