Answer:
Radio-wave communications signals travel through the air in a straight line, reflect off of clouds or layers of the ionosphere, or are relayed by satellites in space. They are used in standard broadcast radio and television, shortwave radio, navigation and air-traffic control, cellular telephony, and even remote-controlled toys.
Explanation:
Answer:
the transcontinental railroads were built all around the US and were used for trade and to transport goods all over the place
Answer:
A.) Banks charged depositors interest if they did not withdraw money at regular intervals
