Answer: Disease (economic disruptions) Also keep in mind that bacterica, cancer, tumors etc. were not brought up till the 1980's - 2000's
Explanation: Look at my comment because it got cencored for some reason
Answer:
Not 100% sure but I think its the Barail Range. This would affect them by the mountain acting almost like a barrier between them. So they didn't have much interaction.
Answer:
the moon infront of sun
Explanation:
the moon moves infront of the sun very slowly and that how it interact the phases
The Galapagos Islands are famous because it is where Charles Darwin discovered many previously unknown species of animals and inspired him to create the theories of natural selection, survival of the fittest, and evolution.
The prime meridiean or something extremely close. it goes through london.