I NEED HELP ASAP!! In the late 1800s, what was the focus of the American Federation of Labor?
O living conditions, safety, and health benefits
supporting unskilled workers and their rights
work hours, safety, and the right to organize
ending strikes by other labor unions

In the late 1800s, the focus of the american federation of labor was work hours, safety, and the right to organize.

Explanation:

c. the dred scott v. sandford case,

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.