List trading items each regional Maya city had.
Highlands:
Lowlands:

They grew cotton, rubber tress, and cocoa beans. They traded with the highlands since the highlands can't any crops. They formed the first urban civilization in Mesoamerica around 1200 BC.

Explanation:

The goods, which were moved and traded around the empire at long distance, include: salt, cotton mantels, slaves, quetzal feathers, flint, chert, obsidian, jade, colored shells, Honey, cacao, copper tools, and ornaments. Due to the lack of wheeled cars and use of animals, these goods traveled Maya area by the sea.

d. it spread christianity. i just took the test and got it right.

they thoght they were going to nuke each other