Laser beams can be used like radio waves to carry signals. But, laser beams are not sent through the air. Laser beams are sent through optical fibers. Optical fibers are long, thin strands of glass or plastic. The fibers can carry light for long
distances without letting the light escape. Optical fibers are used by doctors. They let doctors see inside the body. Optical
fibers are used to carry signals for telephone calls and television programs. Signals travel more quickly through optical
fibers than through wires,

Write about 50 words explaining whether or not this passage supports that explanation.in the introduction, you heard genghis khan’s explanation of why the mongols were successful conquerors in his time. the mongols were illiterate . . and perhaps no more than 700,000 in number. . they were herdsmen on the grassy plains north of the gobi desert, south of siberia’s forests. before the year 1200, the mongols were fragmented, moving about in small bands headed by a chief, or khan, and living in portable felt dwellings. the mongols endured frequent deprivations [hardships] and sparse areas for grazing their animals. they frequently fought over turf, and during hard times, they occasionally raided, interested in goods rather than bloodshed.