A bench mark can indicateon a map​

What two advantages do the coastal countries of west africa have over the sahel countriesfertile soil and mineral resources temperatures and terrain human resources and natural resources weather patterns and location

Part a: in paragraph 2, you can infer from the phrase "..thegreat triumph in mathematics" that the lieutenant is:

The purple arrow on the map above is pointing to the an important line of latitude. a. tropic of capricorn b. equator c. international date line d. prime meridian