While one requires oxygen and one does ______ and anaerobic respiration are both forms of cellular respiration—that is, they
are processes by which cells break down glucose to use as energy.
not aerobic
not. Aerobic
not, aerobic
not; aerobic
Choice C is the best answer. A comma is the appropriate way to link the dependent clause “While...not” and the independent
clause that follows.
Choice A is incorrect. This choice creates a run-on sentence error. “While...not” is a dependent clause, which must be
separated from the independent clause that follows with some sort of punctuation. Choice B is incorrect. This choice
creates a sentence fragment. “While one requires oxygen and one does not” isn’t an independent clause, so it can’t stand
alone as a complete sentence. Choice D is incorrect. This choice creates a punctuation error. “While one requires oxygen and
one does not” isn’t an independent clause, so it can’t be linked to the clause that follows with a semicolon.