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Which of the following is a small-scale, frequent disturbance?

The epidemiological transition refers primarily to ___.

In ecosystems, energy ___ but matter ___.

Prior to the 1800s the human population was in a dynamic equilibrium, exhibiting slow growth. Which of the following was most responsible for the low rate of growth?

After the grasshoppers had eaten most of the grasses, the population crashed. As the population recovered, each female grasshopper was able to produce 10 offspring that survived to adulthood.  As the population continued to grow, the number of surviving offspring produced dropped to five.  What kind of mechanism is now regulating the grasshopper population?

A human population profile (or pyramid) illustrates the ___   

Community Interactions  Match the following, giving the correct plus/minus designation:   

If the total fertility rate of less developed countries were reduced to 2.0 per female, the population would ___

Sea urchins feed on kelp.  In kelp forests, sea otters control the population of sea urchins by eating them (see illustration below).  What happened when sea otter populations were decimated in the last century as the result of the fur trade?   

At what stage of the demographic transition is most of the developing (poor) world now?