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Difficulty: Very hardExplicit Detail Retrieval

In early nineteenth-century paleobotany, Adolphe Brongniart���s 1828 treatise Histoire des végétaux fossiles established an epochal taxonomy for fossilized flora based on carbonaceous deposit strata. Whereas prior naturalists classified specimens strictly through modern Linnaean analogies, Brongniart correlated distinct floral assemblages with progressive paleoclimatic shifts. Crucially, Brongniart argued that elevated atmospheric carbon dioxide during the primary epoch sustained the lush growth of vascular cryptogams while inhibiting terrestrial vertebrate diversification. However, contrary to subsequent commentary, Brongniart did not cite atmospheric oxygen depletion as the cause of coal-swamp forest decline; rather, he explicitly maintained that tectonic uplift altered regional hydrologic regimes, thereby desiccating the low-lying basin habitats required for lycophyte spore germination.

According to the passage, Brongniart identified which of the following as the direct cause of the decline of coal-swamp forests?

  1. Tectonic shifts that modified local hydrological systems and dried out habitats necessary for spore germination.Answer
  2. B
    A gradual reduction in atmospheric oxygen concentrations during the primary epoch.
  3. C
    Competition resulting from the rapid evolutionary diversification of terrestrial vertebrates.
  4. D
    The misapplication of modern Linnaean taxonomic frameworks to prehistoric floral specimens.
  5. E
    Unprecedented global temperature drops that directly impaired cryptogam photosynthesis.

Answer

Tectonic shifts that modified local hydrological systems and dried out habitats necessary for spore germination.
The passage explicitly states that Brongniart maintained that 'tectonic uplift altered regional hydrologic regimes, thereby desiccating the low-lying basin habitats required for lycophyte spore germination.' The option referencing tectonic shifts modifying local hydrological systems accurately paraphrases this explicit detail.

Step-by-Step Solution

1
Locate the targeted concept in the passage text
Identify the sentence discussing the decline of coal-swamp forests: '...he explicitly maintained that tectonic uplift altered regional hydrologic regimes, thereby desiccating the low-lying basin habitats required for lycophyte spore germination.'
Explicit detail retrieval requires matching the exact question claim to its corresponding source sentence.
2
Analyze the causal mechanism explicitly stated by the author
Cause = tectonic uplift altering regional hydrologic regimes; Effect = desiccation of low-lying basin habitats essential for lycophyte spore germination.
Distinguish between what the author explicitly affirms versus factors explicitly negated or mentioned out of context.
3
Evaluate option paraphrases against explicit passage evidence
The statement referencing tectonic shifts modifying local hydrological systems directly paraphrases the passage's explanation.
The correct answer in GRE Reading Comprehension must strictly reflect the text without adding unwarranted assumptions or missing restrictive modifiers.

Key Concept

Explicit Detail Retrieval
Estimated Time:2m 0s
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Explicit Detail Retrieval

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