Around 12,000 Years Ago, a Sudden Extinction Occurred on the Temperate

question 73

Multiple Choice

Around 12,000 years ago, a sudden extinction occurred on the temperate grasslands of North America, during which most of the diverse large mammal species died out. A corresponding extinction did not occur on the African savanna, also a temperate grassland, and today it still has diverse herds of large mammals. What possible, but controversial, explanation is thought by some people to explain the North American extinction?

• A) Declining habitat or food supply due to climate change
• B) Arrival of humans in North America
• C) Receding ice sheets, leading to a climate too warm to support megafauna
• D) Expanding ice sheets, leading to a climate too cold to support megafauna

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