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Which of the following is a mechanism by which new susceptible individuals enter a population?
Prototype
A typical example of a category that embodies the most common and salient features of that category.
Triangle
A geometric shape consisting of three sides and three angles.
Gold
A yellow precious metal, highly valued for its rarity, durability, and shiny luster, used for currency, jewelry, and other art objects.
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Q72: Which of the following types of immunity