Answer:
communication
Explanation:
due to writing we are able to communicate fluently with one another
15+25+35+45=120 120 divide 4 = 30
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Answer:Inventors and Inventions of the Industrial Revolution
Spinning and weaving. ...
The steam engine. ...
Harnessing electricity. ...
The telegraph and the telephone. ...
The internal-combustion engine and the automobile.
Explanation: