Final answer:
Sentence fragments disrupt cohesion, while repetition, parallelism, and exemplification enhance it.
Explanation:
Sentence fragments create a lack of cohesion in writing as they are incomplete sentences lacking an independent clause. These fragments can disrupt the flow of ideas and coherence within a piece of writing.
Repetition, parallelism, and exemplification, on the other hand, are elements that contribute to cohesion by establishing connections between sentences or ideas through consistent structures or themes.
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