Answer:
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The correct answer is B. locate Web pages related to a specific subject.
An example of a search engine is Google: it helps you find Websites with the content you're looking for.
You have a raspberry pi connected to all the sensors and a code running to trigger if the sensors are triggered. Each sensor and keypad would run to a different input on the pi. They should al be able to be powered with a single cell lipo. Is that what you are asking?
Answer:
a flat or tubular narrow closely woven fabric (as of silk or rayon) used for trimmings or knitting. b : a narrow fabric used for tying packages. c : a piece of usually multicolored ribbon worn as a military decoration or in place of a medal. d : a strip of colored satin given for winning a place in a competition