PrepTest 88, Section 2, Question 3
Horses, although descended from a forest-dwelling ancestor, thrive in grasslands. In the last 2 million years, horses have gone through three cycles of population increase followed by a rapid decline in population. The most recent cycle peaked 25,000 years ago during a cold period that preceded a period of warming.
Horses, although descended from a forest-dwelling ancestor, thrive in grasslands. In the last 2 million years, horses have gone through three cycles of population increase followed by a rapid decline in population. The most recent cycle peaked 25,000 years ago during a cold period that preceded a period of warming.
Horses, although descended from a forest-dwelling ancestor, thrive in grasslands. In the last 2 million years, horses have gone through three cycles of population increase followed by a rapid decline in population. The most recent cycle peaked 25,000 years ago during a cold period that preceded a period of warming.
Horses, although descended from a forest-dwelling ancestor, thrive in grasslands. In the last 2 million years, horses have gone through three cycles of population increase followed by a rapid decline in population. The most recent cycle peaked 25,000 years ago during a cold period that preceded a period of warming.
Which one of the following, if true, most helps to explain why the horse population peaked 25,000 years ago and then rapidly declined?
The forest-dwelling ancestor of horses was many times smaller than horses.
The only true wild horse existing today, Przewalski's horse, inhabits the cold grasslands of Central Asia.
Some modern species that are related to horses, such as zebras, inhabit the warm grasslands of Africa.
During cold periods there are extensive grasslands, but these tend to revert to forest when the climate warms.
Several cycles of a cold period followed by a period of warming have occurred in the last 2 million years.
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