Answer:
Let's take a look at the modern day headphones we have now. They're airpods. Wirless. It used to be connected to wires. And those earbuds used to be headphones. And those headphones used to be heavy speakers.
Explanation:
How did they evolve with growth in technology? Back in the early 1890s, headphones were single-sided, heavy speakers that people would hold on to an ear to communicate. This later evolved into something known as an 'Electrophone'. It was a system consisting of a stethoscope-shaped headphone connected to a switchboard.
We started using them in the wars to communicate with the troops on the ground and now we use them to stay focused, to disappear and to give ourselves some time away from the stressful world we live in.
Answer:
D. In the mantle
Explanation:
The core of the Earth is extremely hot, and material in the mantle close to the core is heated
<span>The Answer is 3; enlargement</span>
Emperors in Russia were called tsars.
The largest, or most populated city, in Wisconsin is Milwaukee.
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