What can physical system have on the planet?

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

companies passed on production and transportation costs to consumers