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The geologic record indicates that a desert expands and [#permalink]
27 Feb 2004, 21:06
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The geologic record indicates that a desert expands and contracts in response to alternating dry and wet climatic periods, whether there is any human intervention. (A)
(B)with or without human intervention
(C)when there is human intervention and when there is none.
(D)human intervention or not
(E)no matter whether humans intervene.