In one theory, what led humans to move north into europe? a) an ice age started and the planet got colder. b) an ice age ended and the planet warmed up. c) humans were starving and needed more food. d) humans invented boats and could sail to europe.

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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.