Nine-year-old Pete sorted screws, bolts, and nails into three piles by type. He is able to correctly sort the objects into separate piles because of the logical principle of _____.

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Classification refers to the ability to group objects based on shared characteristics or properties, which is what Pete is doing by sorting screws, bolts, and nails into separate piles. Conservation refers to the awareness that a quantity remains the same despite changes in shape or arrangement. Seriation refers to the ability to arrange objects in an order based on a quantitative dimension, such as size or length. Reversibility refers to the understanding that actions can be reversed or undone.

Nine-Year-Old Pete Sorted Screws, Bolts, and Nails into Three Piles