What was the significance of interchangeable parts?

It made farming less profitable.
It made it possible to produce items in large numbers.
It increased the demand for slave labor.
It undermined the factory system.

there has only been 12 presidents. the 12th president is/was moon jae-in

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copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.

nuclear weapons are hoaxes. many people believe they are real, though.