Question

How did individual cities communicate throughout the large Inca empire?

They lit torches that could be seen by the next city.
They tied knots in different colored strings and passed it from city to city.
They wrote letters that were delivered daily.
They sent messages on trained birds.

Answer 1

They tied knots in different colored strings and passed it from city to city.

Step-by-step explanation:

Answer 2

Answer: The answer is They tied knots in different colored strings and passed it from city to city.

Explanation: It's called Quipu.