Trishon placed a glass of ice cubes on the table The temperature inside the glass was 0°C Thirty minutes later the glass contained water and smaller ice cubes at a temperature of 4°C

Active transport

Explanation:

Diffusion occurs when molecules move from an area of high concentration to a low concentration until equilibrium is achieved. This does not require energy because it is a spontaneous process. This also included osmosis when there’s a difference in the concentration of solutions across a semipermeable membrane, water molecules move from the low concentration the  solution to high concentration until the two solutions are isotonic to each other.

To move molecules against a concentration gradient, energy must be expended. In cell this is through the energy of ATP molecules.