Answer:
1) Optic
2) Optical fiber
3) Light
4) Blockage
5) Taller
6) 5G
7) Radio
8) Mast
9) The Unites States of America
11) High population density (No image)
12) Low population density (No image)
Step-by-step explanation:
1) Underground there are fibre optic cables
2) The materials that these cables are made out of is a flexible optical fiber
3) pulses of light that travel through them
4) buildings or trees that will cause blockage
5) The taller the mast the wider the area that it will cover
6) 2G, 3G, 4G, or 5G
7) Converts your voice to radio waves
8) Each cell has a mast
9) Mobile phones are called 'cell phones' in countries such as The Unites States of America
11) You will see more masts in high population density areas (No image)
12) Than you would in low population density (No image)