Excessive irrigation causes salinization by decreasing the water table and increasing evaporation.

choose one:

True

False

Selective harvesting is a better choice compared to clearcutting because it prevents all the sources of soil erosion.

choose one:

True

False

Eutrophic lakes

choose one:

a.areoverloaded with nutrients

b.have just the right amount of nutrients to support large fish

c.are deprived of nutrients

d.constitute the majority of lakes found in the warm tropics

Which of the following isnota characteristic of keystone species?

choose one:

a.May create new habitats

b.Are a source of prey for many predators

c.Consumes abundant prey populations

d.Influences availability of resources

e.Have a broad range of tolerance

Most marine pollution comes from point sources such as oil tanker vessels.

choose one:

True

False

Succession initiated following a __________ disturbance proceeds relatively _________ because it is an example of secondary succession.

choose one:

a.fire; slowly

b.flood; quickly

c.glacial retreat; slowly

d.hurricane; slowly

e.volcanic eruption; quickly