Como se conoce la edad media : a. Periodo de la civilización oriental comprendido entre el siglo V y el siglo XV
b. Periodo de la civilización occidental comprendido entre los siglos X y XV
c. Periodo de la civilización occidental comprendido entre el siglo V y el siglo XV
d. Periodo de la civilización oriental comprendido entre los siglos X y XV

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;

i'm sure the answer you are looking for would be

a. an ice age

hope this contact me if this didn't or you need with more answers : )