Answer:
In any case, the Byzantine Empire managed to survive after the decline of the Western Roman Empire due to a number of advantageous circumstances. ... Combined with a lack of mass Germanic migration into their territories, the Eastern Roman Empire was thus in a much better position to survive the collapse of the Empire.
Explanation:
It's called Naturalization.
The structure and durability of the papyrus is what made it last for so long.
Worlds highest mountain peak would be Himalaya. They are known for tallest mountains worldwide. Hope this helps. :)