Question 233·Medium·Boundaries
As the Museum of Natural History's head curator notes, fossils are most informative when researchers analyze them in _____ focusing solely on isolated specimens often leaves critical environmental clues undiscovered.
Which choice completes the text so that it conforms to the conventions of Standard English?
For boundaries questions, identify whether what follows the blank is an independent clause or a dependent clause (often signaled by words like "because," "although," or "while"). Use a semicolon only between two independent clauses. Avoid ending the sentence (with a period) right before a dependent clause, since that creates a fragment.
Hints
Spot the connector
Look at the word that begins the second part of the sentence. If it’s a subordinating conjunction like because, the idea that follows won’t be able to stand alone as its own sentence.
Test the strong punctuation
Try placing a period or semicolon before because and read it aloud. Does it create a complete sentence followed by a fragment?
Remember what semicolons and colons do
A semicolon joins two independent clauses. A colon typically introduces an explanation or list. Neither is normally followed immediately by because in this structure.
Step-by-step Explanation
Identify what comes after the blank
After the blank, the sentence continues with: "focusing solely on isolated specimens often leaves critical environmental clues undiscovered." With the word because, this becomes a dependent reason clause (a "because" clause) explaining why analyzing fossils in context matters.
Check which punctuation can come before a dependent "because" clause
A dependent clause introduced by because should not be preceded by a sentence-ending mark (like a period) or by a semicolon, since semicolons join independent clauses.
Eliminate options that break sentence structure
- B) "context; because" is wrong because a semicolon must join two independent clauses, but the clause introduced by because is dependent.
- C) "context. Because" is wrong because it starts a new sentence with a dependent clause, creating a fragment.
Eliminate the remaining incorrect punctuation and choose the correct completion
- A) "context: because" is wrong because a colon introduces an explanation/list and is not correctly followed by a subordinating conjunction like because.
- D) "context because" correctly connects the main idea to its reason without misusing punctuation.
Therefore, the correct choice is context because.