In an equilibrium population (at its carrying capacity), thousands of eggs and hundreds of tadpoles are produced by a single pair of frogs. On average, about how many offspring per pair will live to reproduce?

No population can grow indefinitely. The ultimate size of any population is limited by __________.

A variety of opossum that lives on an island with no predators lives much longer than its relatives on the mainland, even when both are kept safely in a zoo. The island variant's genes have been selected for slow aging, whereas the mainland variant's genes have been selected for quick reproduction. The island opossum exhibits __________ selection, and the mainland opossum exhibits __________ selection.

The logistic growth model differs from the exponential growth model in that it __________.

A newly mated queen ant founds a nest in an unoccupied patch of suitable habitat. Assuming that no disasters strike the nest, which of the following types of equation is likely to best describe the population growth of the new colony?

A population that is growing logistically __________.

A wildlife biologist is trying to predict what will happen to a bear population if bear hunting is banned. He had the equations all worked out but then realized that he had grossly underestimated the amount of food available to the bears. To make his prediction more accurate he should __________ the value of __________ in his equation. (Consider food to be a factor that limits the size of the bear population.)

A population that grows rapidly at first and then levels off at carrying capacity can be modeled __________.

Assuming that r has a positive value, in the formula dN/dt = r_maxN(K – N)/K, the factor rN tends to cause the population to do what?