The underlined sentence adds variety and meaning to the writing in the following ways:
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by introducing a new idea - The sentence brings attention to the specific event of fruit trees flowering, which adds depth to the description of spring.
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by combining ideas in a complex sentence - The sentence presents the concept of flowering fruit trees in a way that enhances the overall imagery and connection to the theme of spring.
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by combining ideas in compound sentence - It links the state of the fruit trees with the overall theme of new life in spring, reinforcing the idea of growth and renewal in a cohesive manner.
(So, the correct options would be the second, third, and fifth.)