The author talks about windshields in the last paragraph primarily for the following reasons:
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to offer evidence that insect populations have declined - The mention of clean windshields and less frequent bug splatters serves as anecdotal evidence indicating that insects, including butterflies, are becoming less common.
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to refer to an idea from paragraph 1 - The idea of insects splattering on windshields originated in the first paragraph, where the author discusses a book about decoding insect splatters. The connection reinforces the ongoing decline of insect populations discussed throughout the article.
So, the two correct answers are:
- to offer evidence that insect populations have declined
- to refer to an idea from paragraph 1