Final answer:
The latitude which is a Great Circle and a Rhumb Line and the zero datum for parallels of latitude is the equator.
Step-by-step explanation:
The latitude which is a Great Circle, a Rhumb Line, and the zero datum for parallels of latitude is the equator.
Lines of latitude, also known as parallels, are circles that are parallel to the equator. The equator is the largest circle of latitude and is located at 0 degrees latitude.
Unlike lines of longitude, which are great circles that meet at the poles, the equator is a great circle that does not intersect the poles but rather divides the Earth into the Northern Hemisphere and the Southern Hemisphere.