In part of the model, materials move out of the bag and into the water. Which of the following cell processes does this best model?
A. Substances move from an area of low concentration to an area of
high concentration.
B. Small molecules easily pass between the phospholipids in the cell
membrane.
C. Transport proteins use energy to push large molecules across the
cell membrane.
O D. A vacuole opens to release substances into the area outside the
cell.
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