The Fifteenth Amendment to the United States Constitution a. ended the institution of slavery and indentured servitude throughout the United States. b. prohibited federal and state governments from denying any citizen the vote because of race. c. guaranteed women the right to vote in federal elections but did not allow them to vote in state elections. d. made the income tax constitutional for the top 30 percent of wealthy white Americans but not black southerners.

b.prohibited federal and state governments from denying any citizen the vote because of race.

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.