In the lecture what do the Ice Age and the creation of the Sahara Desert both illustrate
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In the lecture, what do the Ice Age and the creation of the Sahara Desert both illustrate about past climate changes？ Choose 2 answers.
A．That some climate changes benefitted the development of civilization
B．That some climate changes were not caused by human activity
C．That some climate changes were caused by a decrease of moisture in the atmosphere
D．That some climate changes were caused by changes in Earth"s motion and position
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