GEOLOGY

Detailed explanation-1: -no longer in existence; having ended or died out: extinct pre-Colombian societies. no longer in use; obsolete: an extinct custom.

Detailed explanation-2: -An extinct animal no longer exists. It is completely gone and can no longer be found.

Detailed explanation-3: -A species is extinct in the wild when it only survives in cultivation (plants), in captivity (animals), or as a population well outside its established range. A species may be listed as extinct in the wild only after years of surveys have failed to record an individual in its native or expected habitat.

Detailed explanation-4: -The species which no more exist on the earth are known as extinct species.