#Question id: 4703
#Section 2: Evolution
Within a few weeks of treatment with the drug 3TC, a patientʹs HIV population consists entirely of 3TC-resistant viruses. How can this result best be explained?
#Question id: 4705
#Section 2: Evolution
Darwin and Wallace's theory of evolution by natural selection was revolutionary because it ________.
#Question id: 4706
#Section 2: Evolution
Which of the following statements best explains why modification or change in an organ or tissue during the lifetime of an individual is not inherited?
#Question id: 4707
#Section 2: Evolution
For which one of the following observations were both Lamarck's hypothesis and Darwin's hypothesis in complete agreement?
#Question id: 4708
#Section 2: Evolution
The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?
#Question id: 4709
#Section 2: Evolution
The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.
In Darwin's tree of life, each fork in the tree represents ________.