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Standard English Conventions Difficulty: Hard

In paleontology, the term “Elvis taxon” gets applied to a newly identified living species that was once presumed to be extinct. Like an Elvis impersonator who might bear a striking resemblance to the late musical icon Elvis Presley himself, an Elvis taxon is not the real thing, blank is a misidentified look-alike.

Which choice completes the text so that it conforms to the conventions of Standard English?

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Explanation

Choice D is the best answer. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so making them into two separate sentences is grammatically correct. 

Choice A is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with at least a comma + a coordinating conjunction. This choice provides the coordinating conjunction “but,” but it’s missing a comma. Choice B is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with a semicolon, a colon, a dash, a period, or a comma + a coordinating conjunction. Choice C is incorrect. This choice creates a run-on sentence error. The clause “Like an Elvis impersonator…real thing” and the clause “it is…look-alike” are both independent clauses, so they need to be separated with at least a comma + a coordinating conjunction. This choice provides a comma, but it’s missing a coordinating conjunction.