The diagram shows a pump. Which labels can replace X and the Y in the diagram?

1. X: potassium, Y: sodium
2. X: sodium, Y: potassium
3. X: sodium, Y: calcium
4. X: calcium, Y: potassium

The diagram shows a pump Which labels can replace X and the Y in the diagram 1 X potassium Y sodium 2 X sodium Y potassium 3 X sodium Y calcium 4 X calcium Y po class=