The rate of extinction is faster.
they are much lower
Mainly habitat loss and over hunting, poaching.
Threatend Species
Individual organisms differ, but some of this variation is heritable. Species alive today are descended with modifications from ancestral species that lived in the distant past.
Individual organisms differ, but some of this variation is heritable. Species alive today are descended with modifications from ancestral species that lived in the distant past.
Individual organisms differ, but some of this variation is heritable. Species alive today are descended with modifications from ancestral species that lived in the distant past.
today's species evolved from those of the past.
No difference no brains in the past no brains today
Threatend Species
Threatend Species
There were five major extinction events in the past. They are called the Cretaceous-Tertiary (or K-T) extinction event, the late Devonian mass extinction, the Permian mass extinction, the Ordovician-Silurian mass extinction and the Triassic-Jurassic mass extinction event.
Georges Cuvier, a French naturalist, is credited with proposing the concept of species extinction in the early 19th century. Cuvier observed fossil evidence of species that no longer existed and theorized that they had become extinct due to catastrophic events in the past.