In the mid-nineteenth century, naturalists broadly accepted the 'azoic zone' hypothesis proposed by Edward Forbes, which posited that marine life could not exist below 300 fathoms due to extreme pressure and lack of light. However, when Thomas Henry Huxley examined deep-sea mud samples in 1868, he identified a gelatinous substance that he claimed was Bathybius haeckelii, a primitive, protoplasmic organism representing the original evolutionary source of all life. Huxley’s claim briefly galvanized the scientific community, as it appeared to provide empirical support for Darwinian evolution. Yet, this excitement was short-lived. During the 1872–1876 Challenger expedition, chemists onboard subjected fresh sea-bottom sediments to rigorous testing and discovered that Bathybius was not a living organism at all, but merely an inorganic precipitate of calcium sulfate formed when alcohol was added to preserve seawater samples. Rather than undermining marine biology, this public refutation accelerated the adoption of rigorous chemical analysis in oceanography and highlighted the necessity of evaluating biological specimens in their natural environment rather than relying solely on preserved laboratory samples.
Which of the following statements accurately describe a primary purpose or central theme of the passage? Select all that apply.
- It traces how a mistaken scientific hypothesis regarding deep-sea life ultimately contributed to methodological advancements in oceanography.Answer
- BIt details the specific chemical reaction between alcohol and seawater that produces calcium sulfate precipitates.
- It illustrates the role of empirical testing in resolving a high-profile scientific controversy over primordial organisms.Answer
- DIt demonstrates that Edward Forbes's azoic zone hypothesis was fully vindicated by the findings of the Challenger expedition.
- EIt argues that Thomas Henry Huxley intentionally fabricated biological evidence to bolster Darwinian evolutionary theory.