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moving cellular material
cells take in food, oxygen, and other substances from the environment and release waste into the the environment
selectively (semi) permeable
regulates what enters and exits the cell, it is based on the size of the particles and the size of the openings in the membrane.
when molecules move from an area of higher concentration to an area of lower concentration.
Some molecules can only enter and exit the cell with the help of molecules in the cell membrane called transport proteins.m
when the relative number of molecules are equal in the two areas; diffusion stops when this is reached
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