passenger pigeons' problem (10)
I believe the answer is:
extinction
(Other definitions for extinction that I've seen before include "Death of a species" , "Process of dying out" , "Complete annihilation" , "Dying-out" .)
I believe the answer is:
extinction
(Other definitions for extinction that I've seen before include "Death of a species" , "Process of dying out" , "Complete annihilation" , "Dying-out" .)