Difficulty: Hard
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Many species of plant-eating megafauna such as mammoths and mastodons died out in North America at the end of the last ice age (roughly 10,000 BC), and some scholars claim that they were eradicated primarily by human hunters who arrived on the continent beginning around 14,000 BC. However, others think that the cause was a concurrent change in plant distribution, generally believed to be due to warming of the planet at the end of the ice age.

Which of the following is an assumption the park manager's argument requires?

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