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 Dana D
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#105697
Complete Question Explanation

Resolve the Paradox. The correct answer choice is D.

The stimulus explains that horses thrive in grasslands, and that in the last 2 million years they have experienced three cycles of population increase followed by rapid population decline. The most recent cycle peaked during a cold period which was immediately followed by a period of warming and population decline.

We are asked to select the answer choice that would most help to explain why the horse population peaked during the cold period and then rapidly declined. To pre-phrase, we are likely looking for an answer choice that ties something beneficial to horses to the is unique to the cold period during which the population thrived. We know horses thrive in the grasslands, so this information maybe helpful as well.

Answer Choice (A) This information is irrelevant. We need to explain the population boom and decline, not the size of horses.

Answer Choice (B) We are not talking solely about wild horses, so this information is not that helpful. The information also doesn't explain why the population would change based on the temperature.

Answer Choice (C) Irrelevant because it talks about zebras, not horses, and because it doesn't help explain why horses would thrive in the cold.

Answer Choice (D) This is the correct answer. It ties together something that is beneficial to horses (grasslands) and to the cold period when horse population is up. It also explains why the population declines in the warm climate - the grasslands disappear.

Answer Choice (E) This restates information in the stimulus but does not explain the phenomenon.
 svd24
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#102031
Could someone please post explanations for the correct answer and wrong answers? Thank you!
 Luke Haqq
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#102092
Hi svd24!

To address the correct answer choice, answer choice (D) states, "During cold periods there are extensive grasslands, but these tend to revert to forest when the climate warms." This explains why the horse population peaked 25,000 years ago and then rapidly declined.

As the stimulus states, horses "thrive in grasslands." We're also told that there was a population peak "25,000 years ago during a cold period that preceded a period of warming." If grasslands revert to forest when the climate warms, this would take away something (grasslands) in which horses thrive. It'd therefore explain why the population peaked 25,000 years ago and then rapidly declined. The decline would be caused by a lack of grasslands.

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