All of the following are density-dependent factors that can influence population size except
a. Weather
b. Food supply
c. Waste concentration in the environment
d. Infectious disease
e. Supply of suitable habitat for survival

According to the graph shown here, the carrying capacity for fruit flies in the environment of the culture bottle is .

a. 0 flies

b. 100 flies

c. 150 flies

d. Between 100 and 150 flies

e. Impossible to determine

The observation that members of a population are uniformly distributed suggests that

a. Resources are distributed unevenly.

b. The members of the population are competing for access to a resource.

c. The members of the population are neither attracted to nor repelled by one another.

d. The density of the population is low.

With regard to its rate of growth, a population that is growing logistically

a. Grows fastest when density is lowest

b. Has a high intrinsic rate of increase

c. Grows fastest at an intermediate population density

d. Grows fastest as it approaches carrying capacity

Pose a hypothesis to explain why the human population has undergone especially rapid growth over the past 200 years. Describe two examples of density-dependent factors that limit human population growth. Is it possible that humans have surpassed Earth's carrying capacity?

In contrast to nonhuman populations, human population growth rates have begun to decline due to

a. Voluntarily increasing death rates

b. Voluntarily decreasing birth rates

c. Involuntary increases in death rates

d. Involuntary decreases in birth rates

e. Density-dependent factors

According to the logistic growth equation

$\frac{dN}{dt}=rN\frac{(K-N)}{K}$

a. The number of individuals added per unit time is greatest when N is close to zero.

b. The per capita population growth rate increases as N approaches K.

c. Population growth is zero when N equals K.

d. The population grows exponentially when K is small.

Which of the following represents a demographic transition?

a. A population switches from exponential to logistic growth

b. A population reaches a fertility rate of zero

c. There are equal numbers of individuals in all age groups

d. A population switches from high birth and death rates to low birth and death rates

Explain why biologists want to maintain (a) 'habitat corridors' that connect populations in a metapopulation, and (b) unoccupied habitat that is appropriate for the species in question.