In the summer of 2000, only 10 percent of the lobster population in Long Island Sound survived after a massive die-off. Many lobstermen in New York and Connecticut lost small businesses that their families had owned for generations. Some believe the die-off followed heavier sprays of pesticides to control mosquitoes that carry the West Nile virus. Explain why a chemical substance that targets mosquitoes might also harm lobsters but not fish.

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