SORU: aşağıdaki parçaya göre cevaplayınız
According to the passage, when we say that a species has become extinct, we mean …….…..
Extinction, in geological history, is the complete disappearance of a species of living organism. This occurs when the number of deaths begins to exceed the number of births among members of the species, over its geographical range, and the trend is not interrupted or reversed. Episodes of mass extinction are distinguished by the simultaneous, worldwide disappearance of many different species. The first scientific evidence of mass extinctions was discovered in the fossil record by the French palaeontologist Georges Cuvier early in the 19th century.