Which of the following describes fusion occurring in a hybrid zone?

Under which of the following conditions could evolution by natural selection NOT occur?

Which of the following is not a cause of sympatric speciation?

An earthquake decimates a wolf population, killing 95% of the wolves. The surviving population happens to have smaller teeth, on average, than the initial population. If teeth size is genetically determined, what effect has the wolf population experienced during the earthquake?

Two species of lizards belonging to the same genus occasionally mate, but the embryos stop developing after a day and then die. These two species are separated by ________.

Three-spined mosquitofish show substantial heritable variation in gill-whisker length related to differences in their diets. Longer gill-whiskers are better for capturing open-water prey, while shorter gill-whiskers are better for capturing shallow-water prey. Medium size gill-whiskers struggle with capturing all types of prey.Which of the following types of selection would occur in a large lake with a high density of these fish if both long and short gill-whiskers are favored?

Which of the following is the correct sequence of events under the influence of natural selection with genetic variation in the population? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship.  

In which of the following environments would one find the greatest number of endemic species?

Structures such as human arms, bat wings, cat legs, and whale flippers all do different functions, but they contain many of the same bones. These structural similarities are an example of ________.

Everyone cheats in school, and we all know it’s no big deal.