Answer:
-he invented the electric telegraph that transmitted information instantaneously. -he developed the semaphore system, there by revolutionizing communications. -Telegraph wires spread across the continent by following railroad tracks west. -The first telegraph.
Answer: C
Explanation:
they yell it so people can have a good idea where the ball is coming from.
I believe cellphones should be allowed to use in schools because, research purposes and taking pictures. Phones are a great source of research instead of having to take up space in the computer room. They also take pictures, so students are able to record lectures and take pictures of notes.