7. the inca developed complex calendars and used them to .

The correct answer is that The Inca tribe developed their calendars in order to show the religious festivals that they did in that time. They also used them to mark the seasons with the purpose of plating their crops in the right time of the year. They made in-depth studies to calculate their calendar through the sun and the stars.

answer; use multiple stimuli;

answer; grew into towns and cities;