Which civilization invented the concept of zero and developed an accurate calendar system? A) The Incas

B) The Mayans

C) The Aztecs

The Maya also made significant advancements in mathematics and astronomy. They invented the concept of zero, and they developed an accurate calendar system. Used to guide the Maya agricultural cycles, the calendar was based on observations of the sun and sky over thousands of years.

Explanation:

d) all choices are correct

answer; the period of time known as the middle ages;