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 .

Classification

Explanation:

The principle of classification itself is the  the grouping or arrangement of items in an orderly way.

Pete in this example is unable to sort how objects are ordered correctly, therefore he does not have the knowledge on how to do it correctly.

Pete falls under the principle of classification or classifying objects in groups.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

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