It's C, investigators. Think of Sherlock Holmes looking for clues. Scientists form theories based on observations they get from experiments they conduct.
Answer:
<h2>Telegraph</h2>
Explanation:
Telegraph is the answer I would suggest, as that was the first invention that greatly accelerated the speed of communication. Following that came the telephone, and then after that, cell phones and the Internet. All of these communication tools have accelerated the rate and amount of global communication. But the first step in that direction was the telegraph.
The telegraph was developed in the first part of the 19th century by Samuel Morse and other inventors. Morse also developed a code (which has been named after him) for communicating messages via short and long electronic signals over telegraph wires. Morse sent his first telegraph message in 1844. By 1866 telegraph lines had been laid across the Atlantic Ocean for communication between the USA and Europe.
As summarized by the <em>History Channel, "</em>The telegraph revolutionized long-distance communication. ... Although the telegraph had fallen out of widespread use by the start of the 21st century, replaced by the telephone, fax machine and Internet, it laid the groundwork for the communications revolution that led to those later innovations."
Economists describe the US economy as a mixed market economy because there is both private and public involvement in guiding the economy. Mixed economies are economies in which both the government and the private sector are involved in the economy.
Answer:
because of your ancestors
Answer/Explanation:
Airplane: travel faster by air and can go anywhere not just overland
car: transports people place to place on land quicker than walking
boat: transports people over water quicker than swimming or paddling
bike: a fun healthy way to get places on land faster than walking
hover board: the two wheeled invention that doesn't actually hover but you move with you feet