Answer :
Final answer:
A sign of a pest infestation can be sick food workers, dark brown egg casings, and open trash cans.
Explanation:
A sign of a pest infestation can be sick food workers, as pests can spread diseases to humans. Another sign is dark brown egg casings, which could indicate the presence of certain pests such as cockroaches. Also, open trash cans can attract pests and provide them with a food source.
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