Answer: B. Into the cell
Explanation: If a cell is put into a hypertonic solution, water will leave the cell. When a cell is put into a hypotonic solution, water will enter the cell. And a cell in an isotonic solution water moves into and out of cell at the same time.
Answer: when one is lost, one is formed
So every organism is individually classified without the worry of mixing up two organisms like a fly and nat.