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Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

Select the best hypothesis explaining why countries may have preferred communism. communism promised jobs after the insecurities of war. communists forced the people to do what they said. communism was fueled by a dislike for democracy. communism provided economic freedom for businesses and workers.

The next best alternative given up when making a choice is called the a. opportunity cost b. comparative advantage c. primary objective d. negative consequence select the best answer from the choices provided. a b c d