Gradualism is a pattern of evolution in which
a. a single species evolves into several closely related species.
b. several distantly related species develop similarities.
c. a species evolves at a slow, steady pace.
d. a species has periods of little evolution interrupted by periods of rapid evolution.
mass extinction would most likely result from which of the following events?
a. a disease kills off a single species of predator within an ecosystem.
b. a wildfire burns a national park.
c. global temperatures drop several degrees after several massive volcanic eruptions.
d. a massive earthquake strikes north america.