Extinction occurs naturally as species respond by evolving into new species, or are unable to respond (become extinct) to a changing environment.
(Extinction; occurs naturally; ) (species; respond; ) (species; are; unable to respond (become extinct) to a changing environment) (species; to respond; to a changing environment)
Extinction species species species
occurs naturally respond are to respond
unable to respond (become extinct) to a changing environment
to a changing environment