The correct answer to this question is letter "d. government failures toward social reform." Ray stannard baker wrote the topic on government failures toward social reform. This is the correct answer as far as what Ray Stannard Baker wrote on what certain topic is concerned.<span>
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They lost Salmon,Steelhead, and other species
Having a standard currency in the Abbasid caliph increased the level trade as it facilitated exchange and made it easier to trade. A standard currency makes it possible to trade goods between various countries as it is a widely accepted form of payment