Set 10: Transitions
Explanation
PASSAGE
Coral reefs, often called the 'rainforests of the sea,' support approximately 25% of all marine species despite covering less than 1% of the ocean floor. Rising ocean temperatures, _______ have caused widespread coral bleaching, threatening these vital ecosystems.
Which choice completes the text with the most logical transition?
Detailed Answer Explanation
This question asks you to choose the transition that best connects two ideas. Coral reefs' importance (positive) vs. rising temperatures threatening them (negative). 'However' signals this troubling contrast. Transitions signal the relationship between sentences or paragraphs. Determine the logical relationship (addition, contrast, cause-effect, example) and select the transition that accurately expresses it. The right transition makes the relationship between ideas crystal clear. Consider what logical connection exists: Is the second idea adding to the first? Contrasting it? Showing a result? The transition should accurately reflect this relationship.
Key Evidence:
• "support approximately 25% of all marine species"
• "threatening these vital ecosystems"
Why others are wrong: D (Comparison - the threat contrasts with, not resembles, the biodiversity.), B (Cause/effect - bleaching isn't a result of reef biodiversity.), A (Example - bleaching is a threat, not an example of biodiversity.).
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