Which of the following tree species is a pioneer species in North American forests?

Which of the following is the measurement used by ecologists to determine the biodiversity of a particular area?

Which evolutionary process takes place when disturbance causes a dramatic decrease in the population size, causing the genetic composition of the survivors to substantially differ from the original group?

At which level of complexity does evolution occur?

Which of the following factors does not influence species richness of a community?

Organisms need to acquire energy to survive.  Which of the following are examples of adaptations that allow organisms to acquire the energy needed?

I. The long, slender beak of a hummingbird

II. The echolocation of a dolphin

III. The eyesight of an eagle

Which of the following would be a cultural service of an ecosystem?

Which of the following best describes why the ancestral finch species evolved into several distinct species after arriving on the islands?

According to the theory of island biogeography, which two characteristics of islands should determine the levels of biodiversity found on them?

Which of the following is a likely impact of the slash-and-burn style removal of the Amazon rainforest?

Giant tube worms live on the ocean floor near hydrothermal vents. This environment experiences temperatures far hotter than most organisms can withstand and contains a high concentration of toxic chemicals such as hydrogen sulfide that escape from the vents. Which of the following statements best explains why the giant tube worm can survive in this environment?

Based on the theory of island biogeography, why would a scientist expect to find less biodiversity on an island 25 kilometers from the mainland than on an island 8 kilometers from the mainland?

A local ecologist has noticed that the population of bald eagles has fallen considerably over the past several years while other populations have remained stable. After running tests, the ecologist found that levels of DDT in fish in the area were extremely high. In this case, the bald eagles would be considered:

Urban barn swallows have adapted to live under the bridges of busy expressways in major metropolitan areas. Below is a group of measurements of wing length from a population of barn swallows living under bridges and a population of barn swallows living in a rural setting.

Which of the following can explain the difference in wing length seen between the two populations?

Which of the following is the best example of a keystone species in a pond ecosystem?