In 1914 many Americans found it difficult to remain neutral about the European war. Why?

Most Americans including President Woodrow Wilson were firmly anti-war.

Explanation:

President Woodrow Wilson and many other Americans in 1914 believed that the war in Europe just simply wasn't any of there business, so they stayed out of it, until a German u-boat sunk the Lusitania off the coast of Ireland, killing American passengers, thus bringing America into the war.

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.

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."