GENERAL KNOWLEDGE

Detailed explanation-1: -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-2: -Many species have become extinct because of human activities such as hunting, overharvesting, the conversion of natural ecosystems to cropland and urban areas, pollution, and other alternations or destruction of natural environments.

Detailed explanation-3: -Species endangerment and extinction have three major anthropogenic causes-overhunting or overharvesting; introduction of nonnative species, including the spread of disease; and habitat degradation or loss. All three causes probably were factors in prehistoric as well as modern times.

Detailed explanation-4: -Solution: Nile perch is not an extinct species.

Detailed explanation-5: -Chicken frog. The population has decreased with over 90% the last 10 years which makes it critically endangered. Scimitar-horned oryx. Scimitar-horned oryx are extinct in the wild. European bison. Lesser White-fronted Goose. Przewalskis wild horse.