Osmosis and Reverse Osmosis.

Explanation

`{:("Osmosis","Reverse Osmosis"),("1. It is a spontaneous flow of the solvent from pure solvent or dilute solution to more concentrated solution through a semipermeable membrane.","1. It is the passage of a solvent under high pressure from a concentrated solution to puer slovent like water through a semipermeable membrane."),("2. It is a natural phenomenon.","2. It is not natural phenomenon."),("3. No external pressure is required.","3. External pressure is required."),("4. This involves osmotic pressure.","4. This does not involve osmotic pressure."),("5. In this, concentrated solution becomes more dilute.","5. In this concentration of the solution is increased."):}`