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a. melting of glaciers and permafrost
b. loss of high altitude species
c. increased productivity of food crops in the short term
d. increased drought and forest fires
e. all of the above are true
2) All of the following characteristics would make a species more prone to extinction except
a. low population density
b. specialized niche
c. short generation times
d. small population size
e. low reproductive rates

10.
Which of the following are detritivores?
A) worms
B) vultures
C) fungi
D) All of the above
16.
Biomes characterized by high annual rainfalls are located at high elevations.
A) True
B) False
20.
The most likely reason there are few large trees in the tundra is because
A) they are grazed by bison.
B) permafrost restricts root development.
C) the soil is nutrient-poor.
D) the average temperature is too warm.
34.
The caterpillars of cabbage butterflies are the only insects that can eat plants of the mustard family because they
A) eat these plants only when young and tender.
B) have evolved the ability to break down mustard oils into harmless chemicals.
C) are parasites while in this stage of development.
D) All of the above
35.
If the niches of two organisms overlap,
A) the organisms may have to compete directly.
B) the two organisms will always form a symbiotic relationship.
C) both organisms will disappear from the habitat.
D) one organism usually migrates to a new habitat.