The correct answer is cameras
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Paper was a very important element in ancient China, since it was used in very different ways and in practically all parts of society. The most common use of paper was as documents and form of communication. The paper was also used as packaging, currency, payment, books, maps, umbrella, hat and there are records that affirm that the paper was even used as doors and walls inside the houses.
Answer:
Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier.
Explanation:
they were already unreachable but archers helped too
Explanation:
In order to prevent an enemy getting over the wall the castle builders selected their site with great care so that the terrain would be difficult for a belfry to cross. They then made it more difficult by digging a ditch or moat around the curtain walls in order to prevent the towers getting close to the battlements. yet archers played a great role in middle ages by defended castles and kingdoms from top while infantry troops fought.
