Which explains why african slavery was introduced to the americas? a. gold mines in peru offered a chance to gain wealth and africans wanted to work as miners. b. africa had far too many people to feed and looked for places to send them. c. factories in new england could not get enough europeans to come to america to work. d. sugar plantations required large numbers of workers at a low cost.

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.