I think that letter d is the answer
Used a quipu for communication--a quipu is a knot-quilt with each knot or string of knots representing a symbol or number.
Between the verbal language of the Incas and the quipu, they were able to communicate. The quipu was used to keep records and communicate information through the empire.
It actually has two jobs, but the one you're looking for 'judge laws against the constitution to decide whether they are legal or not'.
Hope this helps, if not, comment below please!!!!
Answer:
Explanation:
The second industrial revolution changed the industry and trade of Europe in many ways. It changed the conditions under which the workers did their work. The factories centralized work in buildings that were made with one purpose in mind. Products were made differently because of the assembly line so the time when one worker did something from beginning to end was gone. And many craftsmen were replaced by machines of many sorts.