Acut (roses, rose's, roses') (petals, petal's, petals') will wilt quickly.

rose's; petals

Explanation:

This is the correct combination of words for this sentence. In the first case, the rose requires an "s" because the word represent a possessive. We are talking about a rose that has ownership of the petals. In the second case, the word "petals" requires an "s" because it is a plural form, which means it does not need an apostrophe.

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