What is the diffrence between medieval and renaissance music

music in the middle ages or the medieval times were prayers written by monks and were called Gregorian chants mostly preformed at the mass while renaissance music was the fist introduction to rhythms, harmony, form, and notation.

a and c?

i think it is a and c

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.