In the Mexican-American War, how many troops died from a disease or an accident? What was the total number of casualties in World War I? Which conflict resulted in the highest number of total casualties? In which conflict was the number of battle deaths almost equal to the number of deaths due to accident or disease?

13,000 for the first question

Explanation:

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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.