18. If the inside & outside of a cell are both isotonic, does water still move across the cell membrane? Explain.

Yes

Explanation:

Isotonic means equally inside and outside the cell water can move out and in within not net movement.

In an isotonic environment, the relative concentrations of solute and water are equal on both sides of the membrane. There is no net water movement, so there is no change in the size of the cell

it would be c. xylem.