The form of cellular transport that expends the cell's energy is known as… * Assisted transport
Passive transport
Active transport
Facilitated transport

C- active transport

Explanation:

Because energy is required in this process, it is known as 'active' transport. Examples of active transport include the transportation of sodium out of the cell and potassium into the cell by the sodium-potassium pump. Active transport often takes place in the internal lining of the small intestine.

your answer is "the 1950's"