An effective TOEFL Reading section strategy relies heavily on understanding the exact structure of the test and mastering specific question types.

The TOEFL reading test is designed to evaluate your ability to understand university-level academic texts. You will typically read 3 or 4 passages, each approximately 700 words long, with 10 questions per passage. Time management is crucial, as you have 54 to 72 minutes total to complete the entire section.

TOEFL Reading Section Practice: The Megafauna Extinction

Reading Passage

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At the close of the Pleistocene epoch, approximately 11,700 years ago, a dramatic ecological upheaval occurred across the Americas, northern Eurasia, and Australia. Dozens of species of large-bodied mammals, collectively known as megafauna, vanished from the geological record. In North America alone, roughly 34 genera of large mammals disappeared, including mammoths, mastodons, saber-toothed cats, and giant ground sloths. Unlike earlier mass extinctions in Earth’s history that decimated entire marine and terrestrial ecosystems across all body sizes, the late Pleistocene extinction was remarkably selective, targeting terrestrial animals weighing over 44 kilograms (roughly 100 pounds). For decades, geologists and paleontologists have debated whether this collapse was precipitated by abrupt climatic shifts or by the rapid dispersal of prehistoric human hunters.

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The climate change hypothesis posits that severe environmental stress at the end of the last glacial maximum dismantled the habitats to which megafauna had spent hundreds of thousands of years adapting. As continental ice sheets retreated, global temperatures spiked rapidly, causing a transition from highly productive, mosaic-like grasslands to more homogenous, segregated biomes. The diverse “mammoth steppe”—a vast, unglaciated grassland rich in varied, highly nutritious flora—dissolved into a patchwork of dense forests and barren tundras. Proponents of this view argue that large herbivores, which required massive quantities of diverse vegetation to sustain their bulk, simply could not cope with the dietary fragmentation. Critics of this theory, however, point out a major flaw: these same species had successfully endured dozens of previous glacial-interglacial cycles throughout the Pleistocene without facing extinction.

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This inconsistency gave rise to the “overkill hypothesis,” most notably championed by paul martin. This model asserts that the primary catalyst for the extinction was the arrival of anatomically modern humans possessing sophisticated projectile weaponry, such as the Clovis fluted point in North America. According to this theory, as humans migrated into pristine environments where animals had evolved without a fear of hominids, the megafauna fell easy prey to systematic overhunting. The rapid proliferation of human populations created a “front” of intense hunting pressure that swept across continents faster than the target species could reproduce. The ecological naivety of the prey—their lack of evolved defensive behaviors against human strategies—proved catastrophic.

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Yet, the overkill hypothesis faces its own share of empirical challenges. Archaeological sites containing definitive proof of human predation on megafauna, such as butchered bones or weapon points embedded in ribcages, are surprisingly scarce. While undisputed evidence confirms that humans hunted mammoths and mastodons, there is virtually no archaeological proof that prehistoric humans regularly pursued or slaughtered giant sloths, camels, or horses, all of which died out during the same window. Furthermore, critics argue that primitive hunting bands, regardless of their technological prowess, lacked the sheer numbers and logistical capabilities required to completely eradicate widespread, resilient animal populations across thousands of square miles.

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Consequently, many contemporary scientists favor a synergistic approach that merges aspects of both models. This view suggests that climate-induced habitat fragmentation pushed megafaunal populations into isolated, genetically vulnerable refugia—smaller pockets of remaining ideal habitat. Once restricted to these constrained zones, populations became highly susceptible to secondary stressors. The introduction of human hunting, even if modest, may have acted as the final blow to species already hovering on the brink of ecological collapse. Without the environmental pressure, the hunting might have been sustainable; without the hunting, the populations might have slowly adapted to the new climate. It was the lethal combination of both forces acting simultaneously that sealed their fate.