#Question id: 4652
#Unit 9. Evolution & Diversity of Life Forms
The graph depicts four possible patterns for the abundance of 3TC-resistant HIV within an infected human over time. If 3TC resistance is costly for HIV, then which plot (I—IV) best represents the response of a strain of 3TC-resistant HIV over time, if 3TC administration begins at the time indicated by the arrow?
#Question id: 4653
#Unit 9. Evolution & Diversity of Life Forms
If two modern organisms are distantly related in an evolutionary sense, then one should expect that
#Question id: 4654
#Unit 9. Evolution & Diversity of Life Forms
Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
#Question id: 4655
#Unit 9. Evolution & Diversity of Life Forms
Over evolutionary 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?
#Question id: 4656
#Unit 9. Evolution & Diversity of Life Forms
Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
#Question id: 4657
#Unit 9. Evolution & Diversity of Life Forms
Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?