What is the most probable reason that rhyme and repetition first found their ways into poems?
a. they were written for the upper class.
b. the poems were easier to remember and pass on.
c. heroes in epics tended to talk that way.
d. people wanted a beat they could dance to.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.