bedbugs are small insects that live in and around the bedding of humans and feed on humans at night. Their bites cause redness, itching, swelling at the site of the injury. They can be small and difficult to see during the day when the linens are cleaned. In order to remove bedbugs, an insecticidal agent is often used. In this case, pyrethroid was chemically added to a population of bedbugs. The number of bedbugs in the infestation was significantly reduced. However, over time, the bedbug population rebounded and further application of the pyrethroid was not successful. Evaluate which statements describe occured with the bedbugs and select all that apply.