Roberta is a scientist studying the evolution of reptiles. She noticed that dinosaur fossils are found only in older layers of rock. New layers of rock have lizard fossils that look similar to species that are alive today. What is a general conclusion Roberta can make about how reptiles have changed over time? A. Dinosaurs lived after lizards that share similarities with lizards that are alive today. B.Dinosaurs lived before lizards that share similarities with lizards that are alive today. C.Dinosaurs lived at the same time as lizards that share similarities with lizards that are alive today. D.Roberta cannot make any conclusions about how reptiles have changed over time based on the evidence mentioned above.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees

Kudzu vines grow by climbing and wrapping around trees. trees covered by kudzu can die because they are starved of sunlight. what type of relationship exists between the trees and the kudzu growing on them?