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Difficulty: MediumWords in Context: High-Utility Vocabulary

In planetary science, the discovery of liquid water oceans beneath the icy shells of moons like Europa and Enceladus has reshaped our understanding of habitability. Previously, astrobiologists assumed that life could only exist in a star's circumstellar habitable zone, where surface temperatures allow for liquid water. However, the presence of sub-surface oceans sustained by tidal heating suggests that habitable environments may be far more _______ than once believed, expanding the search for extraterrestrial life beyond traditional orbital boundaries.

Which choice completes the text with the most logical and precise word or phrase?

  1. prevalentAnswer
  2. B
    localized
  3. C
    precarious
  4. D
    formidable

Answer

prevalent
The correct answer is 'prevalent'. The text establishes a contrast between the historical view that life-supporting conditions are restricted to a star's circumstellar habitable zone and the modern understanding that sub-surface oceans on moons like Europa and Enceladus could support life. Because this discovery expands the search beyond traditional boundaries, it suggests that habitable environments are more widespread, or 'prevalent,' than astrobiologists once believed.

Step-by-Step Solution

1
Analyze the context of the sentence containing the blank.
The sentence begins with 'However,' indicating a contrast with the previous sentence's assertion that life could only exist in a star's circumstellar habitable zone.
Understanding context clues and transitions is necessary to determine the direction of the sentence.
2
Identify the relationship between the ideas.
The discovery of sub-surface oceans expands the search beyond traditional boundaries, meaning habitable environments are likely more common or widespread than once assumed.
This relationship dictates the semantic meaning needed for the blank.
3
Evaluate the choices to find the word that means 'common' or 'widespread.'
The word 'prevalent' means widespread or common, which perfectly captures the idea that habitable zones are more abundant and distributed across the universe than previously believed.
Matching the identified contextual meaning to the options yields the correct choice.

Key Concept

Words in Context: High-Utility Vocabulary
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Topics

Words in Context: High-Utility Vocabulary

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