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.

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.