Which of the following is NOT true for the mid-Pliocene:Group of answer choicesHuman migration to Australia occurred over the Sahul land bridgeSea level was up to 20 metres above modern levelsGreenland did not have a permanent ice sheetSouthern Australia experienced wetter conditions as indicated by pollen recordsCarbon dioxide levels were around 400 ppm
Question
Which of the following is NOT true for the mid-Pliocene:Group of answer choicesHuman migration to Australia occurred over the Sahul land bridgeSea level was up to 20 metres above modern levelsGreenland did not have a permanent ice sheetSouthern Australia experienced wetter conditions as indicated by pollen recordsCarbon dioxide levels were around 400 ppm
Solution
The correct answer is: Human migration to Australia occurred over the Sahul land bridge.
The mid-Pliocene, which occurred around 3 million years ago, was a period of warmer global temperatures compared to today. During this time, sea levels were indeed higher, Greenland did not have a permanent ice sheet, southern Australia experienced wetter conditions as indicated by pollen records, and carbon dioxide levels were around 400 ppm.
However, human migration to Australia over the Sahul land bridge did not occur during the mid-Pliocene. The first evidence of humans in Australia dates to around 65,000 years ago, long after the Pliocene epoch. The Sahul land bridge, which connected Australia to New Guinea during periods of lower sea level, would have been available for crossing during glacial periods in the Pleistocene, not the Pliocene.
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