Answer:
likely due to icebergs
Explanation:
russia's coast is close to the pole therefore there is a higher likelihood of icebergs due to frigid temperatures
Americas and Oceania were similar in the way that first they both could developed experienced agricultural practices. Second, they could have their own distinct architecture, art and some other cultural characteristics with any influence from the outside. Third, some external groups sustained their nomadic hunter.-gathering lifestyle. And finally, both of them faced dangers of overpopulation and exposed of diseases they had never been exposed to. They both were different just because they developed large sophisticated societies in isolation merely.
I just answered another of these questions, and the answer is The Bill of Rights.
