Which describes a change in the population that industrialize the u. s. in the late 1800s?
a.
many people moved from rural areas to urban centers.
b.
an increase in american indian workers led to more competition for jobs.
c.
advancements in farming methods allowed people to move so they could start new agricultural communities.
d.
the decrease of young people in cities led to the hiring of older and more experienced workers.

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.

c. the passage of the fifteenth amendment

i believe it's that they cared for people. hope this ! : )