What replaced copper wires in long distance communicationas they are cheaper and less bulky than copper cables carrying the same information

Optical Fiber

Explanation:

Optical fibers have replaced copper wire in long distance communication as they are cheaper and less bulky than copper cables carrying the same information. Optical Fibers transfer information from one place to another by sending pulses of infrared light signals. Light act as carrier waves.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over