Question

how are the equator and the prime meridian used on maps?
to provide a reference system
○ to separate earths four hemispheres
○ to measure distances east and west
○ to identify the location of earths continents

Explanation:

The equator (0° latitude) and prime meridian (0° longitude) form the baseline of the geographic coordinate system. They act as reference lines to define the latitude and longitude of any point on Earth, creating a global reference system. Separating hemispheres is a secondary effect, measuring east-west distance is only the prime meridian's related function, and they don't specifically identify continent locations.

Answer:

to provide a reference system