The presence of parasitic protozoa in a culture of competing Tribolium castaneum and T.confusum
A. can reverse the outcome of competition.
B. decreases the likelihood of coexistence.
C. has no effect on the outcome of competition.
D. increases the likelihood of coexistence.
E. has an effect on the outcome of competition only in the presence of predatory birds.
Which statement about snowshoe hare and lynx populations in boreal Canada is false?
A. Lynx are not the only important predator of snowshoe hares.
B. Lynx and hare populations both oscillate repeatedly, with a similar period.
C. Snowshoe hares rarely deplete their food supply enough to affect their population biology.
D. Trapping records kept by non-scientists can provide useful records of hare population sizes.
E. Field experiments imply that hare cycles depend both on the hares' food and their predators.
Gause's experiments with Paramecium and Didinium showed
A. extinction of the predator, followed by extinction of the prey, in all habitats.
B. coexistence of predator and prey at fairly constant population sizes, in all habitats.
C. coexistence of predator and prey, but with oscillating population sizes, in all habitats.
D. coexistence of predator and prey at fairly constant population sizes, but only in the presence of refuges and predator reservoirs.
E. coexistence of predator and prey with oscillating population sizes, but only in the presence of refuges and predator reservoirs.
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