Political machines were criticized because they a. placed unqualified people in public office. b. used tax payers money to support welfare systems. c. ignored the spoils system. d. favored fair employment practices.

Correct answer choice is :

A political machine is a political group in which an official boss or small group holds the support of a brigade of supporters and businesses, who receive awards for their efforts. The machine's power is based on the strength of the workers to get out the vote for their nominees on election day.

c]extended voting rights to african americans

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.