The Early Middle Ages in Europe (500-1000 A.D.) are often called the Dark Ages because literacy and education declined.
Answer:
population structure
Explanation:
it makes sense for human enviroment interaction
Answer: Columbus thought he had discovered India.
Explanation:
This was actually a surprising factor because after discovering America, it turned out that Columbus all along thought he had discovered India. That is why the native population was called Indians. After the first expedition, Columbus visited America twice more. The original expedition sailed to the Bahamas, and the next two led by Columbus ended up in Cuba and Haiti.