Trappers faced attacks from indians and or wild animals. they also faced dangerous weather such as snow, sleet, and dangerous winds.
Do you mean Alexander The Great?
Cavalry was important because soilders had to move from place to place instead of walking along the hot desert, which was very difficult.
hope this helps :)
D. A card Catalog
Why? Because the card catalog is a "map" of where everything
It can also be an atlas
they handed information down by word. they didnt write so they used word and memory