Acity was intensively sprayed with ddt to control houseflies. the number of houseflies was immediately greatly reduced. each year thereafter, the city was sprayed again, but the flies gradually increased in numbers until 10 years later, when they were almost as abundant as they were when the control program began. what most likely explains this situation?
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Acity was intensively sprayed with ddt to control houseflies. the number of houseflies was immediate...
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