Recognize that populations vary in gene frequency, age distribution, sex ratio, size, and density.

• Define a population.
• State how age distribution, sex ratio, and density can affect the rate of population growth.

Understand why the size of a population tends to increase.

• Describe and draw the stages of a typical population growth curve.
• Identify key components that cause population growth.
• Identify the factors that ultimately limit population size.
• State the importance of the birthrates and deathrates to population growth.

Recognize that human populations obey the same rules of growth as populations of other types of organisms.

• State why the human population must have an upper limit.
• List methods that would effectively control human population size.