In the late 1800s, workers received low wages because

a) their work ethic was low compared to other developed countries

b) the sit down strikes were not as effective as boycotts

c) they could easily be replaced with other workers

d) immigration levels were low in the united states

In the late 1800s, workers organized unions to solve their problems. Their problems were low wages and unsafe working conditions. ... These unions used strikes to try to force employers to increase wages or make working conditions safer. Some unions worked on getting new laws passed. SO BASICALLY A

Explanation:

C) They could easily be replaced with other workers.

Industrialization caused for a rapid increase of population, thus many people were looking for jobs despite having low wages.

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.