In the board game Risk, what is the minimum number of units the defender can roll dice for?

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What is the name of the imaginary line dividing Earth into northern and southern hemispheres? Besides football, what other sport often holds important events during the Thanksgiving holiday weekend? The Galapagos Islands belong to which country? What type of pepper is traditionally smoked and dried to create chipotle peppers? In which branch of mathematics do integrals and derivatives appear?