The period of time during which the production of goods shifted from simple tools to complex machines is called the

byzantine empire is the answer i think you are looking for.

hope this : )

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.