Final answer:
Houseflies can transmit diseases through contaminated food, grasshoppers can cause agricultural losses, and mosquitoes are vectors for diseases like Malaria.
Explanation:
The housefly: The housefly can spread diseases to humans by transferring bacteria from filth to food. This poses a health risk as the bacteria can cause illness when consumed by humans.
Grasshopper: Grasshoppers can negatively impact humans by consuming crops, leading to agricultural losses. This can result in food scarcity and economic challenges for human populations reliant on agriculture.
Mosquito: Mosquitoes are vectors for diseases like Malaria, causing significant human health issues and mortality rates worldwide.
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