They used interchangeable parts. This made the mass production possible and caused it to happen.
Answer:
it introduced new products into their lives
Explanation:
The Colombian exchange took goods from Europe and sent them to the Americas and Africa, in exchange for some of their products. This also helped to better communicate ideas from one place to another. This would also help to get inventions from one place to another and spread it throughout the world. The Americans sent corn over to Europe, which is now a widely eaten vegetable.
Expansive. It means that there are a lot of children, and the population is spiking.
B. The new middle class had leisure time and extra money
