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Para-jumbles 18 / 100

a. Unlike ordinary baryonic matter, dark matter does not interact with electromagnetic radiation, making it undetectable by conventional telescopes and fueling extensive research into hypothetical particles like WIMPs.
b. Its presence is inferred not through direct observation, but from its gravitational effects on visible matter, such as the anomalous rotation curves of galaxies and gravitational lensing.
c. The existence of dark matter is one of the most perplexing mysteries in modern astrophysics, positing an invisible substance that constitutes roughly 27% of the universe's mass-energy content.
d. Consequently, understanding the fundamental nature of dark matter is crucial for a complete cosmological model and for reconciling observed cosmic structures with theoretical predictions.

These sentences, when properly sequenced, form a coherent paragraph. Which of the options best outline their correct order?

1. c, b, a, d

2. c, a, b, d

3. b, a, c, d

4. a, c, b, d

Correct Answer: 1 (c, b, a, d)
To solve "Sentence Rearrangement" or "Para-jumble" tasks, look for the logical flow of ideas:
Step 1 (Introduction): Sentence (c) serves as the best introduction. It defines dark matter, its significance as a mystery, and its approximate contribution to the universe's mass-energy content, setting the stage for the rest of the paragraph.
Step 2 (Elaboration): Sentence (b) logically follows (c). After introducing what dark matter is, (b) explains HOW its presence is known ("Its presence is inferred..."). This directly elaborates on the concept introduced in (c).
Step 3 (Secondary Factor): Sentence (a) then elaborates on the nature of dark matter, specifically its non-interaction with electromagnetic radiation, which explains why it is "invisible" or "undetectable" (a contrast with "ordinary baryonic matter"). This further develops the description of dark matter's properties after its inference has been established.
Step 4 (Conclusion/Result): Sentence (d) acts as the conclusion, starting with "Consequently." It summarizes the importance of understanding dark matter, directly linking back to the mystery and the implications for cosmological models, building on the preceding descriptions of its nature and detection challenges.

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