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Question

Difficulty: MediumColons, Semicolons, and Dashes

Based on the rules of Standard English conventions, enter the punctuation mark that should be placed in the blank to grammatically connect the clauses in the passage.

Answer:In his research on temperate forest canopies, ecologist Liam O'Connor documented a fascinating behavior among certain tree species. Some trees in the dense study plots exhibited a high degree of crown shyness, maintaining a distinct boundary of air between their uppermost branches【;】others grew in close proximity, their leaves overlapping to form a continuous canopy.

Answer

A semicolon (;)
A semicolon is used to link two independent clauses that are closely related in thought but not joined by a coordinating conjunction. In the passage, the clause before the blank ('Some trees in the dense study plots exhibited a high degree of crown shyness, maintaining a distinct boundary of air between their uppermost branches') and the clause after the blank ('others grew in close proximity, their leaves overlapping to form a continuous canopy') are both independent clauses. Therefore, a semicolon is the correct grammatical choice.

Step-by-Step Solution

1
Identify the grammatical structure of the clauses surrounding the blank.
Both the clause before the blank ('Some trees in the dense study plots... uppermost branches') and the clause after the blank ('others grew in close proximity... continuous canopy') are independent clauses.
Determining if the clauses are independent or dependent is necessary to apply the correct punctuation rules.
2
Analyze the relationship between the two independent clauses.
The two clauses present contrasting but closely related observations about different trees' behaviors.
A colon is used when the second clause explains or illustrates the first, whereas a semicolon is appropriate for linking closely related but contrasting independent clauses without a coordinating conjunction.
3
Select the correct punctuation mark.
A semicolon is the standard way to connect these two independent clauses.
Using a semicolon avoids a comma splice and maintains the grammatical integrity of the sentence.

Key Concept

Using semicolons to connect independent clauses
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Topics

Colons, Semicolons, and Dashes

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