Which of the following describes osmosis?
a. oxygen transfers into red blood cells through small gaps in the cell membrane from the oxygen- rich environment surrounding the cells
b. large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.
c. water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.
d. membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.