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the movement of substances through a cell membrane without the use of energy by the cell
the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
the process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane
the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to produce food and oxygen
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