I would have to say technology is using fewer resources to manufacture goods more efficiently.
Answer:
The poorer areas of the cities were characterised by overcrowded, badly built, unsanitary living accommodation, and filthy streets. Cholera, carried by dirty water, killed 16,000 Londoners in 1849 alone, and smallpox, scarlet fever, typhus, scurvy and rickets were rife.
Answer:
A. Interchangeable parts made mass production easier and cheaper.
Explanation: