The shared way of life is "culture" - all other options are entities, and not ways of life. This means that we can only consider options a) and d)
among those, "nation" is a better word for a political entity (but actually I would say that "country" is the best word for a political entity) - so in the end the correct answer is d)
War and disease
hope it helps
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<span>1) The process by which one group takes on the cultural and other traits of a larger group is called integration
</span><span>2). Chinatown in San Francisco and Little Havana in Miami are examples of
</span>culture
