Their stories are told as each is used to illustrate the major causes of animal endangerment and extinction: habitat destruction, poaching, exotic pet trade, human population growth, overhunting and pollution.
(Their stories; are told; ) (each; is used; to illustrate the major causes of animal endangerment and extinction) (each; to illustrate; the major causes of animal endangerment and extinction)
Their stories each each
are told is used to illustrate
to illustrate the major causes of animal endangerment and extinction
the major causes of animal endangerment and extinction