1. Blood proteins in horses are chemically similar to blood proteins in monkeys. This similarity suggests that horses and monkeys
2. The diagram to the right shows the gradual change over time in the anatomy of the horse. Which concept is best illustrated by the physical variations in the horse as its body size and structure change over time?
3. Fossils of an extinct species of giant armadillo were found to be similar to a smaller species of armadillo presently inhabiting the same region. This similarity could best be explained on the basis of
4. A study of the position and shape of the bones in the forelimbs of a flying squirrel, a bat, and a beaver showed that the beaver and the flying squirrel appear to be most closely related. This determination was most likely based on a study in the field of comparative
5. Fossils would most likely be found in
6. The diagram to the right shows undisturbed sedimentary strata (layers) at the bottom of an ocean. The fossils found in layer B resemble the fossils found in layer A. This similarity suggests that
7. According to Darwin's theory of evolution, differences between species may be the result of
8. Two nucleotide sequences found in two different species are almost exactly the same. This suggests that these species
9. According to Charles Darwin, one factor that affects the evolution of a species is
10. In the diagram of a whale below, the bones labeled "pelvis" and "femur" appear to be useless. Structures that do not appear to serve a function in modern organisms are called
11. Which statement best describes evolution?
12. Studies of finches on the Galapagos Islands suggest that the finches' differences in beak structure were most directly due to
13. Biologically similar organisms have similar DNA and proteins. This statement supports the concept of
14. The embryos of fish, chickens, and pigs have gill slits and a tail. The presence of these features suggests that
15. Characteristics of a species that make its members better able to live and reproduce in their environment are known as
16. In his theory of evolution, Charles Darwin was not able to explain the source of
17. Charles Darwin proposed that organisms produce many more offspring than can possibly survive on the limited amount of resources available to them. According to Darwin, the offspring that are most likely to survive are those that
18. One concept that supports the theory of evolution states that organisms best adapted for survival are the ones that will reproduce and pass traits on to future generations. Adaptations that can be passed on do not include
19. Many biologists believe that the great number of different species of organisms which exist on the planet and the present time has resulted from billions of years of
20. What is the most probable reason that fossils found in lower layers of undisturbed rock are not found in upper layers of undisturbed rock in the same rock sequence?
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