One characteristic that distinguishes a population in an extinction vortex from most other populations is thata. it is a rare, top-level predator.b, its effective population size is lower than its total population size.c. its genetic diversity is very low.d. it is not well adapted to edge conditions.

SCIENTIFIC THINKING In 1954, workers at Michigan State University began spraying the elm trees on campus annually with DDT to kill disease-carrying bark beetles. In the spring of 1955, large numbers of dead robins were found on the campus. Observers thought perhaps the robins died after eating earthworms contaminated by DDT the previous spring. Suggest how scientists could have investigated the scientific validity of this idea.

What is a major advantage of herbicide-resistant crops?

The use of organisms to add essential materials to degraded systems defines __________.

__________ is the science of facilitating the return of a degraded ecosystem to a more natural condition.

Complete the following map, which organizes some of the key concepts of conservation biology.

What does species richness refer to? Select True or False for each statement.T/Fthe number of species in an areaT/Fthe evenness of species in an areaT/Fthe functional diversity of a species in an areaT/Fthe phylogenetic diversity of species in an area

Carbon dioxide functions as a greenhouse gas by .a. interfering with water's ability to absorb heat;b. increasing the random molecular motions of oxygen;c. allowing radiation from the sun to reach Earth and absorbing the re-radiated heat;d. splitting into carbon and oxygen and increasing the rate of cellular respiration

The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years isa. increased worldwide primary production.b. increased worldwide standing crop.c. an increase in the amount of infrared radiation absorbed by the atmosphere.d. the burning of larger amounts of wood and fossil fuels.