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Zorluk: OrtaEstablishing Introductions and Thesis Statements

The following is an excerpt from an essay about deep-sea exploration.

In 1977, researchers aboard the research submersible *Alvin* made a startling discovery at the bottom of the Pacific Ocean near the Galápagos Islands. They found hydrothermal vents spewing superheated, mineral-rich water into the pitch-black abyss. More surprising still was the dense community of organisms—including giant tubeworms and unique crabs—thriving around these vents in the absence of sunlight. [1] __________________________________________________ Instead of relying on photosynthesis, these organisms utilized chemosynthesis, a process in which microbes convert toxic chemicals from the vents into energy, establishing a completely new understanding of life's adaptability.

Which choice most effectively introduces the paragraph's explanation of the primary energy source for this ecosystem?

  1. A
    Although scientists had long believed that all life required sunlight to survive.
  2. B
    The study of these deep-sea species reveal how life can adapt to extreme environments.
  3. Scientists soon sought to understand the alternative energy source driving this underwater community.Cevap
  4. D
    Many of these species were previously unknown, they represent a major biological breakthrough.

Cevap

Scientists soon sought to understand the alternative energy source driving this underwater community.
The statement focusing on the search for the alternative energy source is correct because it is grammatically sound and introduces the paragraph's transition to explaining chemosynthesis.

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1
Analyze the sentence following the blank to understand the logical direction of the paragraph.
The next sentence explains that the organisms rely on chemosynthesis to convert toxic chemicals into energy rather than using photosynthesis.
This indicates that the transition sentence must introduce the concept of an alternative energy source or how these organisms survive.
2
Evaluate each choice for grammatical accuracy.
The option beginning with 'Although' is a fragment. The option using 'reveal' has a subject-verb agreement issue with 'study'. The option with 'previously unknown' is a comma splice. Only the option discussing the search for the alternative energy source is grammatically correct.
ACT English requires correct grammar and punctuation as a prerequisite for any sentence selection.
3
Verify that the grammatically correct choice provides the best transition to the rest of the paragraph.
The option focusing on the search for the alternative energy source directly sets up the explanation of chemosynthesis in the next sentence.
This establishes a clear, coherent topic sentence for the second half of the paragraph.

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Establishing Introductions and Thesis Statements
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Establishing Introductions and Thesis Statements

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