Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
Answer:
Antarctica
Explanation:
the ice melts because of global warming
The Bronze Era was a time period in history where basic tools were developed and this epoch has been chosen as a turning point during pre-history where advancement and progression were key for the modern human to come.
