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Zorluk: OrtaParagraph-Level Transitions

In 1977, oceanographers exploring the Galápagos Rift made a discovery that fundamentally altered our understanding of biology. Using the deep-diving submersible Alvin, scientists observed hydrothermal vents—geothermal geysers on the seafloor spewing superheated, mineral-rich water. To their astonishment, these dark, high-pressure environments were teeming with complex life, including giant tube worms and ghost-white crabs.

[1]

Previously, scientists believed that all food chains on Earth ultimately relied on sunlight for energy through photosynthesis. However, these vent communities thrived in complete darkness. Instead of using sunlight, specialized bacteria in the vents utilized hydrogen sulfide—a toxic chemical to most land animals—to produce organic molecules. This process, known as chemosynthesis, proved that life could flourish under conditions once thought completely uninhabitable.

Which choice provides the most effective transition from the preceding paragraph to the paragraph that follows?

  1. This diverse ecosystem challenged long-held assumptions about the necessity of sunlight for sustaining life.Cevap
  2. B
    The submersible Alvin was originally designed for salvage operations, but it proved invaluable for marine biology.
  3. C
    These deep-sea creatures did not require sunlight to survive, they thrived in the cold darkness instead.
  4. D
    Finding these complex organisms challenged the scientific consensus that life was entirely dependent to sunlight.

Cevap

This diverse ecosystem challenged long-held assumptions about the necessity of sunlight for sustaining life.
The correct option effectively connects the rich ecosystem discovered at the vents (mentioned at the end of the first paragraph) to the subsequent discussion of how these organisms survive without sunlight (which is the focus of the second paragraph). It is grammatically correct and uses the appropriate preposition 'about' after 'assumptions'.

Adım Adım Çözüm

1
Analyze the ending of the first paragraph and the beginning of the second paragraph.
The first paragraph ends by describing a teeming ecosystem of tube worms and crabs in the deep sea. The second paragraph begins by discussing the previous scientific belief that all food chains rely on sunlight.
An effective paragraph transition must connect these two main ideas logically.
2
Evaluate the choices for transition relevance and grammatical correctness.
The correct option connects the 'diverse ecosystem' (referring to the creatures in the first paragraph) to the 'necessity of sunlight' (introducing the topic of the second paragraph) and is grammatically correct.
This bridges the gap between the two paragraphs smoothly and logically.
3
Identify grammatical and rhetorical errors in the remaining choices.
The option about Alvin's salvage design is irrelevant to the paragraph's shift in topic. The option about creatures not requiring sunlight is a comma splice. The option about being dependent to sunlight uses incorrect prepositional idiom.
Standard ACT questions test both rhetorical flow and grammatical correctness.

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Paragraph-Level Transitions
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