The given question asks us to compare the Panama Canal and the Suez Canal. The answer states that the Panama Canal is different from the Suez Canal because it has a lock system. A lock system is a series of gates or chambers that are filled with water to raise or lower ships to different water levels. This allows ships to pass through canals that have different elevations.
To further understand the other options, it is important to note that the Suez Canal actually has a lockless, sea-level system. Therefore, option 1 is correct and highlights a key difference between the two canals. Options 2, 3, and 4 do not accurately describe the difference between the two canals.