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What nitrogenous bases are found in rna

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?

What is the difference between the kurds and the shia muslims? a the kurds are a religious group while the shia muslims are an ethnic group. b the kurds and the shia muslims are religious groups. c the kurds are an ethnic group and the shia muslims are a religious group. d the kurds and the shia muslims are ethnic groups.