Answer:
Generally speaking, a key development that occurred globally during the classical era was "D. The expansion of cultural exchange through regional trade", since this was a time of cultural and technological diffusion.
Explanation:
Very fertile farmland was being sold very cheaply and the Gold rush was just beginning
When Ellis Island closed, immigration processing moved to Manhattan.
Basically they started to focus on science, biology,math,and other subjects than in religion including human <span>anatomy.</span>
