Tree ring dating a. can only be used in the Southwest. b. reflects dry and wet years in the tree rings. c. can only be used if you already know the date. d. can only be used on trees less than 500 years old. Please select the best answer from the choices provided A B C D

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The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict

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