The coach is weighing a slightly increased risk of losing against a slightly decreased risk of injury to the star quarterback. this weighing of trade-offs is an example of marginal thinking, because the star quarterback was in for most of the game, and the coach's decision concerns – shifts in probabilities with the game nearly over.

The missing word in the blank is :

small

hence the completed paragraph is:

The coach is weighing a slightly increased risk of losing against a slightly decreased risk of injury to the star quarterback. this weighing of trade-offs is an example of marginal thinking, because the star quarterback was in for most of the game, and the coach's decision concerns small shifts in probabilities with the game nearly over.

the correct answer is "nuclear power plants do not pollute the air". unlike fossil fuel-fired power plants, nuclear power plants do not produce chemicals or other components that could pollute the air. nuclear reactors work with uranium, creating energy by splitting the atoms in a fission chain reaction, which not results in the formation of carbon dioxide or other greenhouse gases.

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