After creating an effective research question, what should a historian have? the answer to the research question a vague thesis with broad research goals the evidence needed to craft an argument a better understanding of potential research problems

D A better understanding of potential research problems

Explanation:

Just got it right

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.

that would be the steamboat because none of the other things are forms of transportation