Base your answer to question 31 on both Documents 1 and 2 and on your knowledge of social studies. Cause - refers to something that contributes to the occurence of an event, the rise of an idea,
or the bringing about of a development.
Effect refers to what happens as a consequence (result, impact, outcome) of an event, an
idea, or a development.
31. Identify and explain a cause-and-effect relationship associated with the historical developments in
documents 1 and 2. Be sure to use evidence from both documents 1 and 2 in your response. [1]

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.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.

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