Question

contestar las siguientes preguntas

Answer 1

Respuesta:

Explicación:

1- A method for marking dot and dashes on paper. (Morse's code)

2- 12 years. He made the first in 1832 but until 1844 he construct one truly practical.

3- Affect the development of the west,making railroad travel safer and allowed bussinessmen to conduct their operations more profitably

4- Smartphones.