Which theory concludes that the universality of stratification can be explained by the necessity to motivate the most qualified people to fill the most important and demanding positions in a society?

FUNCTIONALISM.

Explanation:

Advocates of functionalism argue that society has different aspects and some roles are more important than others. Difficult and important roles demand higher level of motivation (I.e. compensations) for them to be filled.

the allies overtook outlying islands to make access to japan easier.

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