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Para-jumbles 13 / 100

a. Its presence is inferred from gravitational effects on visible matter, radiation, and the large-scale structure of the universe, which cannot be explained by ordinary matter alone.
b. Dark matter is a hypothetical form of matter thought to account for approximately 27% of the mass-energy in the observable universe.
c. Consequently, ongoing experiments worldwide aim to detect dark matter particles directly or through their rare interactions, holding the key to a more complete understanding of cosmic evolution.
d. Unlike normal baryonic matter, dark matter does not interact with the electromagnetic force, meaning it neither absorbs, reflects, nor emits light, making direct detection incredibly challenging.

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

1. b, d, a, c

2. a, b, d, c

3. b, a, d, c

4. d, b, a, c

Correct Answer: 3 (b, a, d, c)
To solve "Sentence Rearrangement" or "Para-jumble" tasks, look for the logical flow of ideas:
Step 1 (Introduction): Sentence (b) is the most logical starting point as it introduces the concept of "dark matter" and provides its basic definition and proportion in the universe. This sets the stage for the rest of the paragraph.
Step 2 (Elaboration): Sentence (a) naturally follows sentence (b). It explains *how* the presence of this hypothetical dark matter is inferred, detailing the gravitational effects that serve as evidence. The phrase "Its presence" clearly refers back to the dark matter introduced in (b).
Step 3 (Secondary Factor): Sentence (d) then introduces a key characteristic of dark matter that explains why it is so difficult to study. It contrasts dark matter with "normal baryonic matter" and explains its lack of electromagnetic interaction, which directly leads to the "incredibly challenging" aspect of its detection.
Step 4 (Conclusion/Result): Sentence (c) serves as the conclusion. The word "Consequently" indicates a result or an ongoing action taken in response to the challenges mentioned in (d). It discusses the current efforts to detect dark matter, building on the preceding explanation of its elusive nature and its importance for understanding cosmic evolution.

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