What is the name of the line that runs from the North Pole to the South Pole?

Prime Meridian

A (geographic) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude, as measured in angular degrees east or west of the Prime Meridian.

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Explanation:

landlessness of ordinary people

^^something like that^^^