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.
D. Cambodia (mostly), Thailand, Vietnam
I believe the answer is Africa,
since the top poorest contries in the world are in africa.
Answer:
D. Enabled the transportation of goods from the interior of Canada
A map is a representation of the Earth's surface. It is also a portable document describing an area. A map can also provide data such as migration trends, directions, and rock composition. There are many types of maps: The physical map shows land and water formations: mountains, oceans, rivers, the climate type shows the type of weather conditions occurring in the world, the political map shows how the earth's surface is divided into borders: continents, countries, and states... The science of making maps is referred to as cartography.
