The answer to your question is The grade of a metric bolt is designated by the number stamped on the head of the bolt.
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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)
Explanation:
1) Underground there are fibre <u>optic</u> cables
2) The materials that these cables are made out of is a flexible <u>optical fiber</u>
3) pulses of <u>light</u> that travel through them
4) buildings or trees that will cause <u>blockage</u>
5) The <u>taller</u> the mast the wider the area that it will cover
6) 2G, 3G, 4G, or 5G
7) Converts your voice to <u>radio</u> waves
8) Each cell has a <u>mast</u>
9) Mobile phones are called 'cell phones' in countries such as <u>The Unites States of America</u>
11) You will see more masts in <u>high population density</u> areas (No image)
12) Than you would in <u>low population density</u> (No image)