K-selected or equilibrium species tend to have ____ offspring to whom they provide ____ care. Conversely, r-selected or opportunist species tend to have ____ offspring to whom they provide ____ care.

A country whose population pyramid is widest at the bottom can expect to have ____ population growth in the near future than a country whose population pyramid is of uniform width throughout.

A country’s human population changes can be predicted by looking at its total fertility rate, informally defined as the ____. The “replacement” level for fertility in more- developed countries is ____.

A ____ is all the members of a species that live together in a defined geographical region. A ____ is all the populations of all species living in a single region. An ____ is a community of organisms and the physical environment with which they interact.

Environmental resistance can be defined as all the forces of the environment that act to ____.

Carrying capacity can be defined as the maximum ____ of a given species that a defined geographical region can____.

Does the concept of carrying capacity apply to human beings? Does the planet as a whole have a human carrying capacity, or do human beings have an infinite capacity to improve life through such means as obtaining greater crop yields and becoming more energy efficient?

A(n) _________ consists of all members of a single species that live in a defined geographic region, while a(n) __________ consists of the populations of all species that live in a defined region.

a. ecosystem; community

b. ecosystem; biosphere

c. community; ecosystem

d. population; community

e. biome; ecosystem

Is human disease a form of environmental resistance?

A community and all the nonliving elements that interact with it (sunlight, nutrients, soil, etc.) is called

a. a population group.

b. a biosphere.

c. an ecosystem.

d. a biome.

e. a social system.

Some scientists argue that no single factor poses a greater threat to the environment than the continued growth of the human population, while others believe the use of resources per person is a more critical factor. What arguments can you think of for or against either proposition?