The author talks about windshields in the last paragraph to:
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Refer to an idea from paragraph 1 - The mention of windshields connects back to the introduction, where the author talks about the book that helps kids identify insects on windshields, linking it to the decline in insect populations.
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Offer evidence that insect populations have declined - The reference to fewer bug splatters on windshields serves as a tangible example of the decline in insect populations, reinforcing the concerns raised by entomologists and ecologists.
Therefore, the correct responses would be these two points.