adaptive radiation -periods of recovery, following mass extinctions, new species evolve over several million years to fill new or vacated ecological niches in changed environments.
(new species; evolve; T:over several million years; to fill new or vacated ecological niches in changed environments; T:adaptive radiation -periods of recovery, following mass extinctions) (new species; to fill; new or vacated ecological niches in changed environments)
new species new species
evolve to fill
T:over several million years to fill new or vacated ecological niches in changed environments T:adaptive radiation -periods of recovery, following mass extinctions
new or vacated ecological niches in changed environments