The extinction vortex
A. is what happens as a population decreases and becomes more vulnerable to extinction from a variety of causes.
B. begins when one species in an ecosystem goes extinct and other species follow.
C. is what happens when competing species fight over a single niche, often driving both species to extinction.
D. is a spiral of events that occur once a species has become overcrowded through excess reproduction.
E. is a spiral of events that includes introduction of competing species, overexploitation, and disease, in that order.
A. is what happens as a population decreases and becomes more vulnerable to extinction from a variety of causes.
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