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Zorluk: ZorInferences from the Text

In 1868, biologist Thomas Henry Huxley examined seafloor mud retrieved from the North Atlantic telegraph cable surveys and identified a gelatinous, structureless substance embedded with microscopic calcareous disks (coccoliths). Huxley posited that this matrix was an expansive layer of continuous, primordial living protoplasm carpeting the abyssal ocean floor, naming it Bathybius haeckelii in homage to Ernst Haeckel’s evolutionary theories of abiogenesis. Because Bathybius appeared to bridge the divide between non-living inorganic matter and organized cellular life, it was rapidly assimilated into contemporary evolutionary paradigms as empirical vindication of a universal organic substrate. However, during the 1872–1876 Challenger expedition, naturalists sought to observe Bathybius in freshly hauled abyssal dredgings but consistently failed to detect the gelatinous matrix in fresh seawater. Only after chemist John Young Buchanan added alcohol to store and preserve the specimens did a dense, precipitate-like slime materialize. Subsequent chemical assays demonstrated that the purported organism was merely an inorganic precipitate of hydrated calcium sulfate, formed when the preserving alcohol reacted with seawater sulfates in the presence of sediment. Huxley openly retracted his biological characterization in 1879, acknowledging that the initial observations were artifacts of preservation chemistry rather than evidence of abyssal protoplasm.

Based on the passage, which of the following assertions regarding the scientific investigation of Bathybius haeckelii are logically supported by the text? (Select all that apply.)

  1. Initial scientific acceptance of Bathybius was facilitated in part by its alignment with prevailing theoretical frameworks concerning the origins of living organisms.Cevap
  2. B
    The naturalists aboard the Challenger expedition concluded that deep-sea hydrostatic pressure was essential to maintain the structural integrity of Bathybius protoplasm in its native habitat.
  3. The physical presence of the gelatinous substance in the 1868 seafloor specimens depended upon the addition of a chemical preserving agent to the seawater-sediment mixture.Cevap
  4. D
    Huxley’s 1879 retraction was motivated primarily by contemporary discoveries demonstrating that coccoliths originated exclusively from photosynthetic surface algae rather than abyssal organisms.
  5. E
    The Challenger researchers successfully isolated living cellular organisms from the sediment once the inorganic calcium sulfate precipitate was dissolved.

Cevap

The supported statements are that initial scientific acceptance of the substance was facilitated by its alignment with prevailing theoretical frameworks concerning evolutionary origins, and that the physical appearance of the gelatinous substance in the specimens depended upon the addition of a chemical preserving agent.
The passage directly supports two propositions: first, that theoretical alignment with abiogenesis and evolutionary paradigms encouraged the rapid scientific adoption of the discovery; second, that the physical slime did not exist in pristine seawater dredgings but occurred strictly because alcohol was introduced as a preservative agent, initiating the precipitation of calcium sulfate.

Adım Adım Çözüm

1
Analyze the passage's explanation of how the scientific community initially received Huxley's discovery.
The text notes that the matrix was viewed as bridging inorganic matter and cellular life and was 'rapidly assimilated into contemporary evolutionary paradigms as empirical vindication of a universal organic substrate.' This directly entails that theoretical alignment facilitated its acceptance.
Establishing the link between theoretical receptivity and empirical claims is a core inference target.
2
Examine the text's description of how the gelatinous slime was physically generated in the samples.
The Challenger naturalists found no slime in fresh seawater; it only materialized after Buchanan added alcohol to store and preserve the specimens, which caused a reaction forming hydrated calcium sulfate.
Evaluating the causal relationship between chemical preservatives and specimen artifacts validates the claim regarding sample preparation.
3
Evaluate the remaining choices against the text to eliminate unsupported claims and outside knowledge intrusions.
Claims regarding hydrostatic pressure, modern algal origins of coccoliths, and subsequent isolation of cellular life have no textual foundation in the passage.
Eliminates distractors that rely on unwarranted extrapolation or unstated external facts.

Anahtar Kavram

Inferring implicit causal dependencies and contextual support from explicit textual descriptions
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Konular

Inferences from the Text

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