The answer is 1, 3, 4 and maybe 2 but I'm not sure.
Writing is important because it lets us communicate reliably with people who are not in the same room at the time: we can leave messages for next generations, we can give instructions to others.
To make writing possible, we need a writing system so that writing can be learnt and taught, and can be a skilled shared by people!
The answer is the first option, bodily fluid.
Answer:
For nearly a century, the Bethlehem Steel plant in Bethlehem served as the economic lifeblood of the community, employing tens of thousands of people while producing the steel that built our nation's skyscrapers, bridges and even the U.S. Navy, helping win two World Wars in the process.
Equity, Karl Marx's whole point of socialism is the equality. He wanted the workers to be equal with the company owners. Efficiency and economic growth didn't occur much as socialist countries in the 1900s had very lackluster economies. That was one of the primary reason for the collaspe of the U.S.S.R
