Set 15: Form, Structure & Sense (Advanced)
Explanation
PASSAGE
The phenomenon of bioluminescence, though widely observed across marine _______ remains poorly understood in terms of its evolutionary origins and ecological functions.
Which choice completes the text so that it conforms to the conventions of Standard English?
Detailed Answer Explanation
This question tests your understanding of sentence function and text organization. The phrase 'though widely observed across marine species' is a concessive clause that is parenthetical. A comma closes this clause before the main verb 'remains.' Each sentence in a well-constructed text serves a specific purpose. Consider what role this sentence plays in the argument: does it introduce, support, contrast, or conclude an idea? Understanding why an author includes specific sentences helps you grasp the overall argument. Each sentence should serve a clear purpose: introducing ideas, providing evidence, acknowledging counterarguments, or drawing conclusions. Identify the role to understand the structure.
Key Evidence:
• "The phenomenon of bioluminescence, though widely observed"
• "remains poorly understood"
Why others are wrong: A (A semicolon is too strong between a subordinate clause and main clause.), B (A colon doesn't fit between a subordinate clause and main clause.), C (Missing punctuation fails to properly transition from the subordinate to main clause.).
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