It started out as a monarchy from 753 BC - 509 BC after the last king died Rome turned into a republic all the way from 509 BC - 27 BC and from 27 BC it turned from a republic all the way into a Empire from 27 BC - 476 AD. Long live the Empire!!<span />
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Answer:
Cell phone - convenient communication
Industrial robot - reduction of human work-load
Power tool - faster construction
Explanation:
The cell phone one is obvious. Not so obvious is which of the remaining two goes with which. The industrial robot goes with less human work becasue industrial implies a factory, and robot means it is probably replacing humans. The remaining two also make sense together, because power tools do make construction much faster.
1441-1460AD
Hope this helps.
C because I need the last step
