#Question id: 4601
#XL - T Zoology
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
#Question id: 4602
#XL - S Microbiology
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?
#Question id: 4603
#XL - S Microbiology
Of the following anatomical structures, which is homologous to the bones in the wing of a bird?
#Question id: 4603
#XL - T Zoology
Of the following anatomical structures, which is homologous to the bones in the wing of a bird?
#Question id: 4604
#XL - S Microbiology
Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, which develop from similar embryonic tissues. These structural similarities are an example of ________.
#Question id: 4605
#XL - S Microbiology
Over long periods of time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?