One characteristic that distinguishes a population in an extinction vortex from most other populations is that
a. 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

What does species richness refer to? Select True or False for each statement.

T/Fthe number of species in an area

T/Fthe evenness of species in an area

T/Fthe functional diversity of a species in an area

T/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 is

a. 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