Required in example sentence

In fact, the structures required for such incredible flexibility were once considered so complex that Charles Darwin himself acknowledged that the idea of there having evolved seemed absurd in the highest possible degree.

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Instead of "go anywhere, do anything you want," we actually created a regime that required prior assessment of where you're going and a duty to prevent significant harm.

Just two weeks ago, a bill introduced by Senator Kefalas that would have required athletes, kids under 18, to wear a helmet when they're riding their bike, died in committee.

This artificial hierarchy, because it goes against human desires to be free, required a tremendous amount of violence to maintain.

But one of them was to maintain the economic order of the South, which required not just a supply of cheap labor but an oversupply of cheap labor to work at the will of the land.

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