DDT is an insecticide that was used extensively in agriculture in the mid-1900s to kill many insect pests including the boll weevil (pictured below), another pest of commercial cotton, DDT was initially effective at controlling boll weevil outbreaks, but after about a decade DDT became much less effective, because many populations of boll weevil had evolved resistance to DDT. Which of the following conditions would biologists say was required for the evolution of DDT resistance in a population of boll weevils? A) Boll weevils in the population learned to adapt to the high levels of DDT in the environment. B) The boll weevil population needed to evolve DDT resistance in order to avoid extinction C) A few boll weevils in the population were resistant to DDT before it was ever used. D) Exposure to DDT caused specific, nonrandom mutations for DOT resistance within the population.
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Biology, 21.06.2019 20:00
In the name staphylococcus aureus, aureus is thea. kingdom.b. specific name.c. genus.d. domain name.e. family name.
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Biology, 22.06.2019 02:00
The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.
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Biology, 22.06.2019 07:00
Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false
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DDT is an insecticide that was used extensively in agriculture in the mid-1900s to kill many insect...
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