Based on the intermediate disturbance hypothesis, a community's species diversity is increased bya. frequent massive disturbance.b. stable conditions with no disturbance.c. moderate levels of disturbance.d. human intervention to eliminate disturbance.

The potential evapotranspiration is determined by __________.

Which of the following is the definition of a pathogen?

What is a zoonotic pathogen?

The feeding relationships among the species in a community determine the community'sa. secondary succession.b. ecological niche.c. species richness.d. trophic structure.

According to the island equilibrium model, species richness would be greatest on an island that isa. large and remote.b. small and remote.c. large and close to a mainland.d. small and close to a mainland.

Pioneer species tend to have high and lower survivorship.

According to the generalized species-area curve, when habitat is reduced to 50% of its original size, approximately of the species once present there will be lost.a. 10%;b. 25%;c. 50%;d. 90%;e. it is impossible to estimate the percentage

Predators that are keystone species can maintain species diversity in a community if theya. competitively exclude other predators.b. prey on the community's dominant species.c. reduce the number of disruptions in the community.d. prey only on the least abundant species in the community.