Answer:
Telegraph
Explanation:
Before the invention, information had to be send by horses, boats, trains, and any other transportation. This would take very long and it was ineffective for a lot of train stations. If a locomotive had to abort a departure than the communication would take a long time and it was usually by horses. After the telegraph was made this helped the train station be more effective by knowing exactly when the trains would go to which station. This made the stations much more smoother and have more departures and less waiting time for the people boarding on to them.
The barrier island is the answer tell me if it is correct
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B. new railroads and refrigerated cars
In the 400s, a group of primarily nomadic people named the Berbers formed a kingdom just south of the Sahara desert; they called their kingdom Ghana. They began to use camels to carry goods across the Sahara Desert. From the north came salt; from the west came the rich resources of gold, ivory, and other goods. Ghana was located in the middle of the salt and gold trade routes.
