The first part of the sentence describes a feature that all roses have in common; the second draws a distinction between temperate-climate roses and desert roses. The comparison signaled by unlike should be constructed carefully so as to preserve parallelism without distorting the intended message of the sentence.
(A) The use of both while and though is redundant. The comparison is not parallel; unlike roses, the thorns of desert roses. The sentence illogically compares roses grown in one area
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(A) The use of both while and though is redundant. The comparison is not parallel; unlike roses, the thorns of desert roses. The sentence illogically compares roses grown in one area
...
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