Answer: Active transport requires energy, while passive transport does not.
Step-by-step explanation:
Active and passive transport are both different processes in which substances move across the cell membrane.
Active Transport: The key word in active transport is "active" implying that this process requires energy. This energy is a necessity because substances move against their concentration gradient.
Area of Low Concentration⇒ Area of High Concentration
Passive Transport: The key word in passive transport is "passive," it implies that there is a lack of (no) energy needed as it moves substances along their concentration gradient.
Area of High Concentration ⇒ Area of Low Concentration