- In Africa there are two species of elephants. One species lives in the forest of central Africa and another species lives in the savanna of Africa. It was recently hypothesized that an isolated group of elephants living in western Africa may be a different species from the other two groups. Which development in technology would best be used to determine if the elephants are the same species?
- The half-life of a radioactive isotope is 2,000 years. How much of the radioactive isotopespecimen will remain after 4,000 years?
- Selective breeding has resulted in plants that are resistant to pests and produce a higher yield of fruits and vegetables. Which of these is the most likely disadvantage that can result from this process?
- The Florida panther has been listed as an endangered species since 1967. Which natural occurrence has most likely led to this species being unable to adapt and becoming endangered?
- A river changes course so a population of mice is subdivided into two populations. The forest on the eastern side of the stream contains a land predator that is absent on the western side of the stream. Which outcome will most likely occur in the mice populations over many generations?
- Researchers have discovered that the ear bones of mammals are homologous structures with parts of fish jaws. This suggests that
- Researchers are investigating whether dinosaurs were endothermic like birds. Which evidence from thefossil record could be effectively compared with modern day evidence to support this hypothesis?
- Individuals that carry a particular allele may have more descendants than other individuals, resulting in theallele becoming more common. Which process causes random alleles to become more common within apopulation?
- Which organisms became extinct during the most recent mass extinction?
- Breeding programs and habitat preserves have been established as an effort to protect the Florida Pantherfrom extinction. Studies indicate that a minimum of 50 adult panthers are needed in order to have a self-sustaining population, that is, one that does not need to be supplemented with breeding programs. If a wild population of 40 panthers were left alone, which would most likely happen to the panther population?
- Which factor will most likely increase the survival chances of an organism living in an environment that is undergoing rapid changes?
- Which of the following is a true statement about the extinction of organisms?
- The population sizes of different species of Darwin's finches have varied since records of their numbers have been kept. The drawings show several different species of the finches and their beaks. Darwin's finches live in the same habitat and are subject to the same environmental pressures. Yet, as one population size increases, another decreases, and then the reverse may occur. Which stimulus is most likely to cause these changes in population size?
- Which of the following describes two or more species that have evolved adaptations to each other's influence?
- Why is natural selection, as a scientific model, applied at the population level and not at the individual level?
- When Charles Darwin traveled to the Galapagos Islands, he made observations of many different organisms.Which best describes the results of his research?
- Rounded, floating leaves with waxy covering and flexible stems have made the organism shown suited to the environment in which it lives. Which process is most responsible for adapting this organism to its environment?
- Natural selection is a mechanism that acts on individuals within a population. Which is a result of the process of natural selection?
- As Darwin explored the Galapagos Islands, he found many different species of finches. The finches on each island had beaks that differed.How did Darwin think these birds were related?
- There is evidence the continent of Antarctica once had a tropical climate. However, Antarctica moved southward to its current location over the South Pole of Earth after the breakup of the super continent Pangaea. This movement caused which ecological changes in Antarctica?