The mayans study of astronomy was best used to a) explore continents across the ocean. b) create accurate maps of north america. c) predict the best times to fight a battle. d) decide the best times to plant and harvest crops.

Option:  D) decide the best times to plant and harvest crops.

Explanation:

Astronomy in the life of Mayan people played a major role. With the help of cosmos, Mayan was able to track the seasons for harvesting crops like corn, beans and squash. Mayan was advance in agriculture by using a method called slash and burn before planting crops, terrace Farming, and raised bed farming.

answer; i believe that the correct answer is (c) ///

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.