The diagram shows a normal red blood cell and a shrunken red blood cell, both of which are in salt water. In which direction did the water move to make the red blood cell shrink? Why did water move in that direction?

In the second diagram, the water moves out from the cell to the surroundings. This is because the surroundings of the cell have a higher concentration of salt than the cell. Hence, the water moves out of the cell to a higher concentration.