It is known as career dating
I think it’s c sorry if I am incorrect
10. Coal Engines
11. Machines were created to help/deal with most of the previously manual labor.
12. Polution levels rose, disease became easier to spread, and there was alot of smog about from the factories that popped up everywhere around that time.
Answer:
Development is a process that creates growth, progress, positive change or the addition of physical, economic, environmental, social and demographic components.
Explanation: