Based on evidence from deep-sea cores, there have been at least how many warm-cold cycles since the beginning of the Pleistocene glaciation?

Name: Based on evidence from deep-sea cores, there have been at least how many warm-cold cycles since the beginning of the Pleistocene glaciation?
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The Answer of Based on evidence from deep-sea cores, there have been at least how many warm-cold cycles since the beginning of the Pleistocene glaciation?

Based on Evidence from Deep-Sea Cores, There Have Been at Least