Because there are records and remains of species which are no longer present in the world today.
um, i don't know.
It is hard to determine exactly how many animal species are extinct because some species become extinct before scientists even know they existed. As far as science can tell, there are over 900 extinct species.
You know a species is becoming extinct when its population is decreasing rapidly. The decrease could be caused by human involvement, natural disasters, change of climate, hunting, etc., etc.
when there are no living members of a species the species is said to be "extinct".
A species that dies out is said to be extinct. If this doesn't answer your question, please let me know.
extinct species of Maldives
Extinct (Extinction)
extinct species of maldives
When no living member of a species exists, the species is considered extinct. Extinction occurs when a species has completely disappeared from the Earth, with no individuals remaining alive anywhere in the world.
When a species permanently disappears the species is said to be extinct.
No - there are over 40 known species and no species are known to have become extinct.
The species is said to be extinct.